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Example Application: The Music Store
 

Introduction

This application is used by a company that sells musical instruments of various kinds. During order processing, a customer would specify the items he or she wants and a clerk would find them. In other cases, a customer may want to describe the type of item that he or she wants. The type can be as precise as a guitar, a microphone, or a piano. In other cases, the customer may have an idea of the desired item but cannot make up his or her mind. For example, a customer may want to buy a piano but think that later on, he or she may need electronic sounds. A customer may also want to purchase a drum, but there are various kinds: classic, electronic, or drum machine.

Over all, a clerk would assist a customer locate an item most appropriately suiting to the customer's needs. This application includes a process, through some combo boxes, that allows an employee to locate an item.

Practical Learning Practical Learning: Starting a Custom Collection Class

  1. Start Microsoft Visual C# and create a new Windows Application named MusicalInstrumentStore2
  2. To create a dialog box, on the main menu, click Project -> Add Windows Form...
  3. Set the name to CategoryEditor and click Add
  4. Design the form as follows:
     
    Control Text Name Other Properties
    Label &Category:    
    TextBox   txtCategory Modifiers: Public
    Button OK btnOK DialogResult: OK
    Button Cancel btnCancel DialogResult: Cancel
    Form Property Value
    FormBorderStyle FixedDialog
    Text Category Editor
    StartPosition CenterScreen
    AcceptButton btnOK
    CancelButton btnCancel
    MaximizeBox False
    MinimizeBox False
    ShowInTaskbar False
  5. To create a dialog box, on the main menu, click Project -> Add Windows Form...
  6. Set the name to TypeEditor and click Add
  7. Design the form as follows:
     
    Musical Store Item Type
    Control Text Name Other Properties
    Label &Item Type:    
    TextBox   txtItemType Modifiers: Public
    Button OK btnOK DialogResult: OK
    Button Cancel btnCancel DialogResult: Cancel
    Form Property Value
    FormBorderStyle FixedDialog
    Text Type Editor
    StartPosition CenterScreen
    AcceptButton btnOK
    CancelButton btnCancel
    MaximizeBox False
    MinimizeBox False
    ShowInTaskbar False
  8. To create a dialog box, in the Solution Explorer, right-click MusicalInstrumentStore2 -> Add -> Windows Form...
  9. Set the name to ItemEditor and click Add
  10. Design the form as follows:
     
    Musical Store Item
     
    Control Text Name Other Properties
    Label &Item #:    
    TextBox   txtItemNumber  
    Label &Category:    
    ComboBox   cbxCategories  
    Button New C&ategory... btnNewCategory  
    Label &Item Type:    
    ComboBox   cbxItemTypes  
    Button New &Item Type... btnNewItemType  
    Label Item &Name:    
    TextBox   txtItemName  
    Label &Unit Price:    
    TextBox 0.00 txtUnitPrice TextAlign: Right
    Button Picture... btnPicture  
    TextBox   txtPicturePath  
    PictureBox   pbxPicturePath SizeMode: Zoom
    Button Create btnCreate  
    Button Close btnClose DialogResult: Cancel
    OpenFileDialog (Name): dlgOpen
    Title: Select Item Picture
    DefaultExt: jpg
    Filter: JPEG Files (*.jpg,*.jpeg)|*.jpg|GIF Files (*.gif)|*.gif|Bitmap Files (*.bmp)|*.bmp|PNG Files (*.png)|*.png
    Form Property Value
    FormBorderStyle FixedDialog
    Text Musical Instrument Store - Item Editor
    StartPosition CenterScreen
    MaximizeBox False
    MinimizeBox False
    ShowInTaskbar False
  11. Double-click the New Category button and implement it as follows:
       
    private void btnNewCategory_Click(object sender, EventArgs e)
{
    CategoryEditor editor = new CategoryEditor();

    if (editor.ShowDialog() == DialogResult.OK)
    {
        if (editor.txtCategory.Text.Length > 0)
        {
            string strNewCategory = editor.txtCategory.Text;

            // Make sure the category is not yet in the list
            if (cbxCategories.Items.Contains(strNewCategory))
                MessageBox.Show(strNewCategory + " is already in the list");
            else
            {
                // Since this is a new category, add it to the combox box
                cbxCategories.Items.Add(strNewCategory);
                // Just in case the user wanted to use this new category
                // select it
                cbxCategories.Text = strNewCategory;
            }
        }
    }
}
  12. Return to the Item Editor dialog box and double-click the New Item Type button
  13. Implement the event as follows:
       
    private void btnNewItemType_Click(object sender, EventArgs e)
{
    TypeEditor editor = new TypeEditor();

    if (editor.ShowDialog() == DialogResult.OK)
    {
        if (editor.txtItemType.Text.Length > 0)
        {
            string strNewType = editor.txtItemType.Text;

            // Make sure the type is not yet in the list
            if (cbxTypes.Items.Contains(strNewType))
                MessageBox.Show("The list already contains " +
                                strNewType);
            else
            {
                cbxTypes.Items.Add(strNewType);
                cbxTypes.Text = strNewType;
             }
        }
    }
}
  14. Return to the Item Editor dialog box and double-click the Picture button
  15. Implement the event as follows:
       
    private void btnPicture_Click(object sender, EventArgs e)
{
    if (dlgPicture.ShowDialog() == DialogResult.OK)
    {
        txtPicturePath.Text = dlgPicture.FileName;
        pbxStoreItem.Image = Image.FromFile(txtPicturePath.Text);
    }
}
  16. In the Solution Explorer, right-click Form1.cs and click Rename
  17. Type MusicStore.cs and press Enter twice (to display the form)
  18. Design the form as follows:
     
    Musical Instrument Store
     
    Control Text Name Other Properties
    Label Label Item Category:    
    ComboBox ComboBox   cbxCategories  
    Label Label Items Type:    
    ComboBox ComboBox   cbxTypes  
    Label Label Available Items    
    Button Button New Store Item... btnNewStoreItem  
    ListView ListView   lvwStoreItems View: Details
    FullRowSelect: True
    GridLines: True
    Columns
    (Name) Text TextAlign Width
    colItemNumber Item #    
    colItemName Item Name/Description   320
    colUnitPrice Unit Price Right  
    PictureBox   pbxStoreItem SizeMode: Zoom
    GroupBox GroupBox Selected Items    
    Label Label Item #    
    Label Label Description    
    Label Label Unit Price    
    Label Label Qty    
    Label Label Sub Total    
    TextBox TextBox   txtItemNumber1  
    TextBox TextBox   txtDescription1  
    TextBox TextBox 0.00 txtUnitPrice1 TextAlign: Right
    TextBox TextBox 0 txtQuantity1 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal1 TextAlign: Right
    Button Button Remove btnRemove1  
    TextBox TextBox   txtItemNumber2  
    TextBox TextBox   txtDescription2  
    TextBox TextBox 0.00 txtUnitPrice2 TextAlign: Right
    TextBox TextBox 0 txtQuantity2 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal2 TextAlign: Right
    Button Button Remove btnRemove2  
    TextBox TextBox   txtItemNumber3  
    TextBox TextBox   txtDescription3  
    TextBox TextBox 0.00 txtUnitPrice3 TextAlign: Right
    TextBox TextBox 0 txtQuantity3 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal3 TextAlign: Right
    Button Button Remove btnRemove3  
    TextBox TextBox   txtItemNumber4  
    TextBox TextBox   txtDescription4  
    TextBox TextBox 0.00 txtUnitPrice4 TextAlign: Right
    TextBox TextBox 0 txtQuantity4 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal4 TextAlign: Right
    Button Button Remove btnRemove4  
    TextBox TextBox   txtItemNumber5  
    TextBox TextBox   txtDescription5  
    TextBox TextBox 0.00 txtUnitPrice5 TextAlign: Right
    TextBox TextBox 0 txtQuantity5 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal5 TextAlign: Right
    Button Button Remove btnRemove5  
    TextBox TextBox   txtItemNumber6  
    TextBox TextBox   txtDescription6  
    TextBox TextBox 0.00 txtUnitPrice6 TextAlign: Right
    TextBox TextBox 0 txtQuantity6 TextAlign: Right
    TextBox TextBox 0.00 txtSubTotal6 TextAlign: Right
    Button Button Remove btnRemove6  
    GroupBox GroupBox Order Summary    
    Label Label Items Total:    
    TextBox TextBox 0.00 txtItemsTotal TextAlign: Right
    Label Label Tax Rate:    
    TextBox TextBox 7.75   TextAlign: Right
    Label Label %    
    Label Label Tax Amount:    
    TextBox TextBox 0.00 txtTaxAmount TextAlign: Right
    Label Label Order Total:    
    TextBox TextBox 0.00 txtOrderTotal TextAlign: Right
    Button Button Save btnSave  
    Label Label Receipt #:    
    TextBox TextBox 0.00 txtReceiptNumber  
    Button Button &Open btnOpen  
    Button Button New Order btnNewOrder  
    Button Button Close btnClose  
  19. To create a new class, in the Solution Explorer, right-click MusicalInstrumentStore2 -> Add -> Class...
  20. Set the Name to StoreItem and press Enter
  21. Change the file as follows:
       
    using System;

namespace MusicalInstrumentStore2
{
    [Serializable]
    public class StoreItem
    {
        private string nbr;
        private string cat;
        private string tp;
        private string nm;
        private double prc;

        public string ItemNumber
        {
            get { return nbr; }
            set { nbr = value; }
        }

        public string Category
        {
            get { return cat; }
            set { cat = value; }
        }

        public string Type
        {
            get { return tp; }
            set { tp = value; }
        }

        public string ItemName
        {
            get { return nm; }
            set { nm = value; }
        }

        public double UnitPrice
        {
            get { return prc; }
            set { prc = value; }
        }

        public virtual bool Equals(StoreItem same)
        {
            if( (nbr == same.nbr) &&
                (cat == same.cat) &&
                (tp  == same.tp) &&
                (nm  == same.nm) &&
                (prc == same.prc))
                return true;
            else
                return false;
        }

        public StoreItem()
        {
            nbr = "000000";
            cat = "Accessories";
            tp  = "Accessories";
            nm  = "Unknown";
            prc = 0.00;
        }

        public StoreItem(string itmNumber)
        {
            nbr = itmNumber;
            cat = "Accessories";
            tp  = "Accessories";
            nm  = "Unknown";
            prc = 0.00;
        }

        public StoreItem(string itmNumber, string category,
                  string type, string name, double price)
        {
            nbr = itmNumber;
            cat = category;
            tp  = type;
            nm  = name;
            prc = price;
        }
    }
}
  22. To create a new class, in the Class View, right-click MusicalInstrumentStore2 -> Add -> Class...
  23. Set the Name to StoreItems and press Enter
  24. Change the file as follows:
      
    using System;
using System.Collections;

namespace MusicalInstrumentStore2
{
    [Serializable]
    public class StoreItems : IList
    {
        int counter;
        private object[] items;

        public virtual int Count
        {
            get { return counter; }
        }

        public virtual bool IsSynchronized
        {
            get { return false; }
        }

        public virtual object SyncRoot
        {
            get { return this; }
        }

        public virtual void CopyTo(Array arr, int index)
        {
        }

        public virtual IEnumerator GetEnumerator()
        {
            return null;
        }

        public virtual bool IsFixedSize
        {
            get { return false; }
        }

        public virtual bool IsReadOnly
        {
            get { return false; }
        }

        public virtual object this[int index]
        {
            get { return null; }
            set { }
        }

        // This method is used to add a new item to the collection
        public virtual int Add(object value)
        {
            return 0;
        }

        // This method can be used to insert an item at 
        // a certain position inside the collection
        public virtual void Insert(int index, Object value)
        {
        }

        // This method is used to find out whether the item 
        // passed as argument exists in the collection
        public virtual bool Contains(object value)
        {
            return false;
        }

        // This method is used to check whether the item passed as
        // argument exists in the collection. If so, it returns its index
        public virtual int IndexOf(object value)
        {
            return 0;
        }

        // This method is used to delete the item positioned 
        // at the index passed as argument
        public virtual void RemoveAt(int index)
        {
        }

        // This method first checks the existence of the item passed 
        //  as argument. If the item exists, the method deletes it
        public virtual void Remove(object value)
        {
        }

        // This methods deletes all items from the collection
        public virtual void Clear()
        {
        }

        public StoreItems()
        {
            counter = 0;
            items = new object[5];
        }
    }
}
  25. Save the file
  26. Change the code of the StoreItems.Add() method as follows:
      
    // This method is used to add a new item to the collection
public virtual int Add(object value)
{
    // Find out if the array is getting too small for the next item(s)
    // If it is, increase its size by 5
    if (Count == items.Length)
        Array.Resize(ref items, items.Length + 5);

    if (counter < items.Length)
    {
        items[counter] = value;
        counter++;
        return counter - 1;
    }
    else
        return -1;
}
  27. In the Class View, double-click ItemEditor
  28. In the top section of the file, add the following:
      
    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
  29. In the Solution Explorer, double-click ItemEditor.cs
  30. On the form, double-click the Create button and implement its event as follows:
      
    private void btnCreate_Click(object sender, EventArgs e)
{
    FileStream stmStoreItem = null;
    StoreItem item = new StoreItem();
    StoreItems items = new StoreItems();
    BinaryFormatter bfmStoreItem = new BinaryFormatter();

    // If this directory doesn't exist, create it
    Directory.CreateDirectory(@"C:\Musical Instrument Store");
    // This is the file that holds the list of items
    string FileName = @"C:\Musical Instrument Store\StoreItems.mis";

    // Create a random number that will be used to identify the item
    Random rnd = new Random();
    txtItemNumber.Text = rnd.Next(100000, 999999).ToString();

    // Make sure the user had selected a category
    if (cbxCategories.Text.Length == 0)
    {
        MessageBox.Show("You must specify the item's category");
        cbxCategories.Focus();
        return;
    }

    // Make sure the user had selected a type
    if (cbxTypes.Text.Length == 0)
    {
        MessageBox.Show("You must specify the item's type");
        cbxTypes.Focus();
        return;
    }

    // Make sure the user had entered a name/description
    if (txtItemName.Text.Length == 0)
    {
        MessageBox.Show("You must enter the name (or a " +
                        "short description) for the item");
        txtItemName.Focus();
        return;
    }

    // Make sure the user had typed a price for the item
    if (txtUnitPrice.Text.Length == 0)
    {
        MessageBox.Show("You must enter the price of the item");
        txtUnitPrice.Focus();
        return;
    }

    // Before saving the new item, find out if there was
    // already a file that holds the list of items
    // If that file exists, open it and store its items 
    // in our StoreItems list
    if (File.Exists(FileName))
    {
        stmStoreItem = new FileStream(FileName,
                                      FileMode.Open,
                                      FileAccess.Read,
                                      FileShare.Read);

        try
        {
            // Retrieve the list of items from file
            items = (StoreItems)bfmStoreItem.Deserialize(stmStoreItem);
        }
        finally
        {
            stmStoreItem.Close();
        }
    }

    // Create the music item
    item.ItemNumber = txtItemNumber.Text;
    item.Category = cbxCategories.Text;
    item.Type = cbxTypes.Text;
    item.ItemName = txtItemName.Text;
    item.UnitPrice = double.Parse(txtUnitPrice.Text);

    // Call the Add method of our collection class to add the item
    items.Add(item);

    // Save the list
    stmStoreItem = new FileStream(FileName,
                                  FileMode.Create,
                                  FileAccess.Write,
                                  FileShare.Write);

    try
    {
        bfmStoreItem.Serialize(stmStoreItem, items);

        if (txtPicturePath.Text.Length != 0)
        {
            FileInfo flePicture = new FileInfo(txtPicturePath.Text);
            flePicture.CopyTo(@"C:\Musical Instrument Store\" +
                              txtItemNumber.Text + flePicture.Extension);
        }

        // After saving the item, reset the form
        txtItemNumber.Text = rnd.Next(100000, 999999).ToString();
        cbxCategories.Text = "";
        cbxTypes.Text = "";
        txtItemName.Text = "";
        txtUnitPrice.Text = "0.00";
        txtPicturePath.Text = "";
        pbxStoreItem.Image = null;
    }
    finally
    {
        stmStoreItem.Close();
    }
}
  31. In the Class View, click StoreItems
  32. In the lower part of the Class View, double-click this[int]
  33. Change the code of the property as follows:
      
    public virtual object this[int index]
{
    get { return items[index]; }
    set { items[index] = value; }
}
  34. In the Solution Explorer, double-click ItemEditor.cs
  35. Double-click an unoccupied area of the form and implement its Load event as follows:
      
    private void ItemEditor_Load(object sender, EventArgs e)
{
    // Since all values seem ready, prepare to process the item
    StoreItem item = new StoreItem();
    StoreItems items = new StoreItems();
    BinaryFormatter bfmStoreItem = new BinaryFormatter();

    // This is the file that holds the list of items
    string FileName = @"C:\Musical Instrument Store\StoreItems.mis";

    if (File.Exists(FileName))
    {
        FileStream stmStoreItem = new FileStream(FileName,
                                                 FileMode.Open,
                                                 FileAccess.Read,
                                                 FileShare.Read);

        try
        {
            // Retrieve the list of items from file
            items = (StoreItems)bfmStoreItem.Deserialize(stmStoreItem);

            // Display the categories in the combo box
            for (int i = 0; i < items.Count; i++)
            {
                item = (StoreItem)items[i];

                if (!cbxCategories.Items.Contains(item.Category))
                    cbxCategories.Items.Add(item.Category);
            }

            // Display the items types in the combo box
            for (int i = 0; i < items.Count; i++)
            {
                item = (StoreItem)items[i];

                if (!cbxTypes.Items.Contains(item.Type))
                    cbxTypes.Items.Add(item.Type);
            }
        }
        finally
        {
            stmStoreItem.Close();
        }
    }
    else
    {
        // Create a random number that will be used
	// to identify the item
        Random rnd = new Random();
        txtItemNumber.Text = rnd.Next(100000, 999999).ToString();

        // Make sure the user had selected a category
        cbxCategories.Text = "";
        cbxTypes.Text = "";
    }
}
  36. In the Solution Explorer, double-click MusicStore.cs
  37. Right-click the form and click View Code
  38. Make the following changes:
      
    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace MusicalInstrumentStore21
{
    public partial class MusicStore : Form
    {
        StoreItems items;
        int iFileName;
        bool IsNewCustomerOrder;

        public MusicStore()
        {
            InitializeComponent();
        }

        void LoadMusicStore()
        {
            // Since all values seem ready, prepare to process the item
            items = new StoreItems();
            BinaryFormatter bfmStoreItem = new BinaryFormatter();

            // This is the file that holds the list of items
            string FileName = @"C:\Musical Instrument Store\StoreItems.mis";

            if (File.Exists(FileName))
            {
                FileStream stmStoreItem = new FileStream(FileName,
                                                         FileMode.Open,
                                                         FileAccess.Read,
                                                         FileShare.Read);

                try
                {
                    // Retrieve the list of items from file
                items = (StoreItems)bfmStoreItem.Deserialize(stmStoreItem);

                    // Display the categories in the combo box
                    for (int i = 0; i < items.Count; i++)
                    {
                        StoreItem item = (StoreItem)items[i];

                        if (!cbxCategories.Items.Contains(item.Category))
                            cbxCategories.Items.Add(item.Category);
                    }
                }
                finally
                {
                    stmStoreItem.Close();
                }
            }
        }
    }
}
  39. Return to the Music Store form
  40. On the form, double-click New Store Item
  41. Implement the event as follows:
    private void btnNewStoreItem_Click(object sender, EventArgs e)
{
    ItemEditor editor = new ItemEditor();

    // Create a random number to get it ready for
    // the user creating a new store item
    Random rnd = new Random();
    editor.txtItemNumber.Text = rnd.Next(100000, 999999).ToString();

    if (editor.ShowDialog() == DialogResult.Cancel)
        LoadMusicStore();
}
  42. Return to the Music Store form
  43. Double-click the Categories combo box and implement its event as follows:
      
    private void cbxCategories_SelectedIndexChanged(object sender, EventArgs e)
{
    cbxTypes.Items.Clear();
    cbxTypes.Text = "";
    lvwStoreItems.Items.Clear();
    pbxStoreItem.Image = null;

    if (items.Count == 0)
        return;

    string strCategory = (string)cbxCategories.SelectedItem;

    cbxTypes.Items.Clear();

    for (int i = 0; i < items.Count; i++)
    {
        StoreItem item = (StoreItem)items[i];

        if (item.Category == strCategory)
        {
            if (!cbxTypes.Items.Contains(item.Type))
                cbxTypes.Items.Add(item.Type);
        }
    }
}
  44. Return to the Music Store form
  45. Double-click the Item Type combo box and implement its event as follows:
      
    private void cbxTypes_SelectedIndexChanged(object sender, EventArgs e)
{
    lvwStoreItems.Items.Clear();
    cbxTypes.Text = "";
    pbxStoreItem.Image = null;

    if (items.Count == 0)
        return;

    string strCategory = (string)cbxCategories.SelectedItem;
    string strType = (string)cbxTypes.SelectedItem;

    lvwStoreItems.Items.Clear();

    for (int i = 0; i < items.Count; i++)
    {
        StoreItem item = (StoreItem)items[i];

        if ((item.Category == strCategory) &&
            (item.Type == strType))
        {
            ListViewItem lviStoreItem =
                lvwStoreItems.Items.Add(item.ItemNumber);
            lviStoreItem.SubItems.Add(item.ItemName);
            lviStoreItem.SubItems.Add(item.UnitPrice.ToString("F"));
        }
    }
}
  46. Return to the Music Store form
  47. On the form, double-click the Available Items list view and implement its SelectedIndexChanged event as follows:
      
    private void lvwStoreItems_SelectedIndexChanged(object sender, EventArgs e)
{
    StoreItem item = new StoreItem();

    if ((lvwStoreItems.SelectedItems.Count == 0) ||
        (lvwStoreItems.SelectedItems.Count > 1))
        return;

    string strItemNumber =
	lvwStoreItems.SelectedItems[0].SubItems[0].Text;

    for (int i = 0; i < items.Count; i++)
    {
        StoreItem itm = (StoreItem)items[i];
        if (itm.ItemNumber == strItemNumber)
            item = itm;
    }

    // Make a list of the picture files
    string strDirectory = @"C:\Musical Instrument Store";
    DirectoryInfo dirStoreItems = new DirectoryInfo(strDirectory);
    FileInfo[] PictureFiles = dirStoreItems.GetFiles("*.jpg");

    // Look for a file that holds the same name as the item number
    foreach (FileInfo fle in PictureFiles)
    {
        // Get the name of the file without its extension
        string fwe = Path.GetFileNameWithoutExtension(fle.FullName);

        if (fwe == strItemNumber)
            pbxStoreItem.Image = Image.FromFile(strDirectory + 
		"\\" + item.ItemNumber + ".jpg");
    }
}
  48. Return to the Music Store form
  49. Click the Available Items list view
  50. In the Properties window, click the Events button and double-click DoubleClick
  51. Implement the event as follows:
      
    internal void CalculateOrder()
{
    // Calculate the current total order and update the order
    double subTotal1 = 0.00, subTotal2 = 0.00, subTotal3 = 0.00,
           subTotal4 = 0.00, subTotal5 = 0.00, subTotal6 = 0.00;
    double itemsTotal = 0.00, taxRate = 0.00,
           taxAmount = 0.00, orderTotal = 0.00;

    // Retrieve the value of each sub total
    try
    {
        subTotal1 = double.Parse(this.txtSubTotal1.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    try
    {
        subTotal2 = double.Parse(this.txtSubTotal2.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    try
    {
        subTotal3 = double.Parse(this.txtSubTotal3.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    try
    {
        subTotal4 = double.Parse(this.txtSubTotal4.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    try
    {
        subTotal5 = double.Parse(this.txtSubTotal5.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    try
    {
        subTotal6 = double.Parse(this.txtSubTotal6.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Value");
    }

    // Calculate the total value of the sub totals
    itemsTotal = subTotal1 + subTotal2 + subTotal3 +
                 subTotal4 + subTotal5 + subTotal6;

    // Display the total order in the appropriate text box
    txtItemsTotal.Text = itemsTotal.ToString();

    try
    {
        taxRate = double.Parse(txtTaxRate.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid Tax Rate");
        txtTaxRate.Text = "7.75";
        txtTaxRate.Focus();
    }

    taxAmount = itemsTotal * taxRate / 100;
    orderTotal = itemsTotal + taxAmount;

    txtTaxAmount.Text = taxAmount.ToString("F");
    txtOrderTotal.Text = orderTotal.ToString("F");
}

private void lvwStoreItems_DoubleClick(object sender, EventArgs e)
{
    ListViewItem lviStoreItem = lvwStoreItems.SelectedItems[0];

    if( (lvwStoreItems.SelectedItems.Count == 0) ||
        (lvwStoreItems.SelectedItems.Count > 1) )
        return;

    if(txtItemNumber1.Text == "")
    {
                txtItemNumber1.Text = lviStoreItem.Text;
                txtDescription1.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice1.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity1.Text = "1";
                txtSubTotal1.Text = lviStoreItem.SubItems[2].Text;

                btnRemove1.Enabled = true;
                txtQuantity1.Focus();
    }// If the previous item # text box is not empty, then use the next one
    else if (txtItemNumber2.Text == "")
    {
                txtItemNumber2.Text = lviStoreItem.Text;
                txtDescription2.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice2.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity2.Text = "1";
                txtSubTotal2.Text = txtUnitPrice2.Text;

                btnRemove2.Enabled = true;
                txtQuantity2.Focus();
    }
    else if (txtItemNumber3.Text == "")
    {
                txtItemNumber3.Text = lviStoreItem.Text;
                txtDescription3.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice3.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity3.Text = "1";
                txtSubTotal3.Text = txtUnitPrice3.Text;

                btnRemove3.Enabled = true;
                txtQuantity3.Focus();
    }
    else if (txtItemNumber4.Text == "")
    {
                txtItemNumber4.Text = lviStoreItem.Text;
                txtDescription4.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice4.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity4.Text = "1";
                txtSubTotal4.Text = txtUnitPrice4.Text;

                btnRemove4.Enabled = true;
                txtQuantity4.Focus();
            }
            else if (txtItemNumber5.Text == "")
            {
                txtItemNumber5.Text = lviStoreItem.Text;
                txtDescription5.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice5.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity5.Text = "1";
                txtSubTotal5.Text = txtUnitPrice5.Text;

                btnRemove5.Enabled = true;
                txtQuantity5.Focus();
            }
            else if (txtItemNumber6.Text == "")
            {
                txtItemNumber6.Text = lviStoreItem.Text;
                txtDescription6.Text = lviStoreItem.SubItems[1].Text;
                txtUnitPrice6.Text = lviStoreItem.SubItems[2].Text;

                txtQuantity6.Text = "1";
                txtSubTotal6.Text = txtUnitPrice6.Text;

                btnRemove6.Enabled = true;
                txtQuantity6.Focus();
            } // If all item # text boxes are filled, don't do anything
            else
                return;

    CalculateOrder();
}
  52. Return to the Music Store form
  53. On the form, click the top Unit Price text box
  54. Press and hold Shift
  55. Click the top Qty text box and release Shift
  56. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice1_Leave(object sender, EventArgs e)
{
    int qty = 0;
    decimal unitPrice = 0.00M, subTotal = 0.00M;

    // Get the quantity of the current item
    try
    {
        qty = int.Parse(this.txtQuantity1.Text);
    }
    catch (FormatException)
    {
        // MessageBox.Show("Invalid quantity value for item 1");
    }

    // Get the unit price of the current item
    try
    {
        unitPrice = decimal.Parse(this.txtUnitPrice1.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid unit price for item 1");
    }

    // Calculate the current sub total
    subTotal = qty * unitPrice;

    // Display the new sub total in the corresponding text box
    txtSubTotal1.Text = subTotal.ToString();

    btnRemove1.Enabled = true;

    // Update the order
    CalculateOrder();
}
  57. Return to the Music Store form
  58. On the form, double-click the top Remove button and implement the event as follows:
      
    private void btnRemove1_Click(object sender, EventArgs e)
{
    txtItemNumber1.Text = "";
    txtDescription1.Text = "";
    txtUnitPrice1.Text = "0.00";
    txtQuantity1.Text = "0";
    txtSubTotal1.Text = "0.00";
    btnRemove1.Enabled = false;

    CalculateOrder();
}
  59. Return to the Music Store form
  60. On the form, click the second Unit Price text box
  61. Press and hold Shift
  62. Click the second Qty text box and release Shift
  63. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice2_Leave(object sender, EventArgs e)
{
    int qty = 0;
    decimal unitPrice = 0.00M, subTotal = 0.00M;

    try
    {
        qty = int.Parse(this.txtQuantity2.Text);
    }
    catch (FormatException)
    {
        // MessageBox.Show("Invalid quantity value for item 2");
    }

    try
    {
        unitPrice = decimal.Parse(this.txtUnitPrice2.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid unit price for item 2");
    }

    subTotal = qty * unitPrice;
    this.txtSubTotal2.Text = subTotal.ToString();

    btnRemove2.Enabled = true;
    CalculateOrder();
}
  64. Return to the Music Store form
  65. On the form, double-click the second Remove button and implement the event as follows:
      
    private void btnRemove2_Click(object sender, EventArgs e)
{
    txtItemNumber2.Text = "";
    txtDescription2.Text = "";
    txtUnitPrice2.Text = "0.00";
    txtQuantity2.Text = "0";
    txtSubTotal2.Text = "0.00";
    btnRemove2.Enabled = false;

    CalculateOrder();
}
  66. Return to the Music Store form
  67. On the form, click the third Unit Price text box
  68. Press and hold Shift
  69. Click the third Qty text box and release Shift
  70. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice3_Leave(object sender, EventArgs e)
{
    int qty = 0;
    decimal unitPrice = 0.00M, subTotal = 0.00M;

    try
    {
        qty = int.Parse(this.txtQuantity3.Text);
    }
    catch (FormatException)
    {
        // MessageBox.Show("Invalid quantity value for item 3");
    }

    try
    {
        unitPrice = decimal.Parse(this.txtUnitPrice3.Text);
    }
    catch (FormatException)
    {
        MessageBox.Show("Invalid unit price for item 3");
    }

    subTotal = qty * unitPrice;
    this.txtSubTotal3.Text = subTotal.ToString();

    btnRemove3.Enabled = true;
    CalculateOrder();
}
  71. Return to the Music Store form
  72. On the form, double-click the third Remove button and implement the event as follows:
      
    private void btnRemove3_Click(object sender, EventArgs e)
        {
            txtItemNumber3.Text = "";
            txtDescription3.Text = "";
            txtUnitPrice3.Text = "0.00";
            txtQuantity3.Text = "0";
            txtSubTotal3.Text = "0.00";
            btnRemove3.Enabled = false;

            CalculateOrder();
        }
  73. Return to the Music Store form
  74. On the form, click the fourth Unit Price text box
  75. Press and hold Shift
  76. Click the fourth Qty text box and release Shift
  77. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice4_Leave(object sender, EventArgs e)
        {
            int qty = 0;
            decimal unitPrice = 0.00M, subTotal = 0.00M;

            try
            {
                qty = int.Parse(this.txtQuantity4.Text);
            }
            catch (FormatException)
            {
                // MessageBox.Show("Invalid quantity value for item 4");
            }

            try
            {
                unitPrice = decimal.Parse(this.txtUnitPrice4.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid unit price for item 4");
            }

            subTotal = qty * unitPrice;
            this.txtSubTotal4.Text = subTotal.ToString();

    btnRemove4.Enabled = true;
            CalculateOrder();
        }
  78. Return to the Music Store form
  79. On the form, double-click the fourth Remove button and implement the event as follows:
      
    private void btnRemove4_Click(object sender, EventArgs e)
        {
            txtItemNumber4.Text = "";
            txtDescription4.Text = "";
            txtUnitPrice4.Text = "0.00";
            txtQuantity4.Text = "0";
            txtSubTotal4.Text = "0.00";
            btnRemove4.Enabled = false;

            CalculateOrder();
        }
  80. Return to the Music Store form
  81. On the form, click the fifth Unit Price text box
  82. Press and hold Shift
  83. Click the fifth Qty text box and release Shift
  84. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice5_Leave(object sender, EventArgs e)
        {
            int qty = 0;
            decimal unitPrice = 0.00M, subTotal = 0.00M;

            try
            {
                qty = int.Parse(this.txtQuantity5.Text);
            }
            catch (FormatException)
            {
                // MessageBox.Show("Invalid quantity value for item 5");
            }

            try
            {
                unitPrice = decimal.Parse(this.txtUnitPrice5.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid unit price for item 5");
            }

            subTotal = qty * unitPrice;
            this.txtSubTotal5.Text = subTotal.ToString();

    btnRemove5.Enabled = true;
            CalculateOrder();
        }
  85. Return to the Music Store form
  86. On the form, double-click the fifth Remove button and implement the event as follows:
      
    private void btnRemove5_Click(object sender, EventArgs e)
        {
            txtItemNumber5.Text = "";
            txtDescription5.Text = "";
            txtUnitPrice5.Text = "0.00";
            txtQuantity5.Text = "0";
            txtSubTotal5.Text = "0.00";
            btnRemove5.Enabled = false;

            CalculateOrder();
        }
  87. Return to the Music Store form
  88. On the form, click the sixth Unit Price text box
  89. Press and hold Shift
  90. Click the sixth Qty text box and release Shift
  91. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtUnitPrice6_Leave(object sender, EventArgs e)
        {
            int qty = 0;
            decimal unitPrice = 0.00M, subTotal = 0.00M;

            try
            {
                qty = int.Parse(this.txtQuantity6.Text);
            }
            catch (FormatException)
            {
                // MessageBox.Show("Invalid quantity value for item 6");
            }

            try
            {
                unitPrice = decimal.Parse(this.txtUnitPrice6.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("Invalid unit price for item 6");
            }

            subTotal = qty * unitPrice;
            this.txtSubTotal6.Text = subTotal.ToString();

    btnRemove6.Enabled = true;
    CalculateOrder();
}
  92. Return to the Music Store form
  93. On the form, double-click the sixth Remove button and implement the event as follows:
      
    private void btnRemove6_Click(object sender, EventArgs e)
        {
            txtItemNumber6.Text = "";
            txtDescription6.Text = "";
            txtUnitPrice6.Text = "0.00";
            txtQuantity6.Text = "0";
            txtSubTotal6.Text = "0.00";
            btnRemove6.Enabled = false;

            CalculateOrder();
        }
  94. Return to the Music Store form
  95. On the form, click the Tax Rate text box
  96. In the Events section of the Properties window, double-click Leave and implement the event as follows:
      
    private void txtTaxRate_Leave(object sender, EventArgs e)
{
    CalculateOrder();
}
  97. Return to the Music Store form
  98. Double-click the New Order button and implement its event as follows:
      
    private void btnNewCustomerOrder_Click(object sender, EventArgs e)
{
    // We will store our files in the following folder    
    string strDirectory = @"C:\Musical Instrument Store\Receipts";
    DirectoryInfo dirInfo = Directory.CreateDirectory(strDirectory);

    // Get the list of files, if any, from our directory
    FileInfo[] fleList = dirInfo.GetFiles();
    string strFilename = "";

    // If there is no file in the directory,
    // then we will use 1000 as the first file name
    if (fleList.Length == 0)
    {
        iFileName = 1000;
    }
    else // If there was at least one file in the directory
    {
        // Get a reference to the last file
        FileInfo fleLast = fleList[fleList.Length - 1];
        // Get the name of the last file without its extension
        string fwe = Path.GetFileNameWithoutExtension(fleLast.FullName);
        // Increment the name of the file by 1
        iFileName = int.Parse(fwe) + 1;
    }

    // Update our global name of the file
    strFilename = strDirectory + "\\" + iFileName.ToString() + ".cos";
    txtReceiptNumber.Text = iFileName.ToString();

            cbxCategories.Text = "";
            cbxTypes.Text = "";
            lvwStoreItems.Items.Clear();

            txtItemNumber1.Text = "";
            txtDescription1.Text = "";
            txtUnitPrice1.Text = "0.00";
            txtQuantity1.Text = "0";
            txtSubTotal1.Text = "0.00";

            txtItemNumber2.Text = "";
            txtDescription2.Text = "";
            txtUnitPrice2.Text = "0.00";
            txtQuantity2.Text = "0.00";
            txtSubTotal2.Text = "0.00";

            txtItemNumber3.Text = "";
            txtDescription3.Text = "";
            txtUnitPrice3.Text = "0.00";
            txtQuantity3.Text = "0.00";
            txtSubTotal3.Text = "0.00";

            txtItemNumber4.Text = "";
            txtDescription4.Text = "";
            txtUnitPrice4.Text = "0.00";
            txtQuantity4.Text = "0.00";
            txtSubTotal4.Text = "0.00";

            txtItemNumber5.Text = "";
            txtDescription5.Text = "";
            txtUnitPrice5.Text = "0.00";
            txtQuantity5.Text = "0.00";
            txtSubTotal5.Text = "0.00";

            txtItemNumber6.Text = "";
            txtDescription6.Text = "";
            txtUnitPrice6.Text = "0.00";
            txtQuantity6.Text = "0.00";
            txtSubTotal6.Text = "0.00";

            txtItemsTotal.Text = "0.00";
            txtTaxRate.Text = "7.75";
            txtTaxAmount.Text = "0.00";
            txtTotalOrder.Text = "0.00";
        }
  99. Return to the Music Store form
  100. Double-click the Save button and implement the event as follows:
      
    private void btnSave_Click(object sender, EventArgs e)
{
    // We will store our files in the following folder    
    string strDirectory = @"C:\Musical Instrument Store\Receipts";
    DirectoryInfo dirInfo = Directory.CreateDirectory(strDirectory);

    // Get the list of files, if any, from our directory
    FileInfo[] fleList = dirInfo.GetFiles();
    string strFilename = "";

    // If this is a new customer order,
    // get ready to create a name for the file
    if (IsNewCustomerOrder == true)
    {
        // If there is no file in the directory,
        // then we will use 1000 as the first file name
        if (fleList.Length == 0)
       {
            iFileName = 1000;
        }
        else // If there was at least one file in the directory
        {
            // Get a reference to the last file
            FileInfo fleLast = fleList[fleList.Length - 1];
            // Get the name of the last file without its extension
            string fwe = Path.GetFileNameWithoutExtension(fleLast.FullName);
            // Increment the name of the file by 1
            iFileName = int.Parse(fwe) + 1;
        }

        // Update our global name of the file
        strFilename = strDirectory + "\\" + iFileName.ToString() + ".cos";
        txtReceiptNumber.Text = iFileName.ToString();

        IsNewCustomerOrder = false;
    } // If a cleaning order was already opened, we will simply update it
    else
        strFilename = @"C:\Musical Instrument Store\Receipts\" +
                       txtReceiptNumber.Text + ".cos";

    StreamWriter wrtCustomerOrder = new StreamWriter(strFilename);

            try
            {
                wrtCustomerOrder.WriteLine(txtItemNumber1.Text);
                wrtCustomerOrder.WriteLine(txtDescription1.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice1.Text);
                wrtCustomerOrder.WriteLine(txtQuantity1.Text);

                wrtCustomerOrder.WriteLine(txtItemNumber2.Text);
                wrtCustomerOrder.WriteLine(txtDescription2.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice2.Text);
                wrtCustomerOrder.WriteLine(txtQuantity2.Text);

                wrtCustomerOrder.WriteLine(txtItemNumber3.Text);
                wrtCustomerOrder.WriteLine(txtDescription3.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice3.Text);
                wrtCustomerOrder.WriteLine(txtQuantity3.Text);

                wrtCustomerOrder.WriteLine(txtItemNumber4.Text);
                wrtCustomerOrder.WriteLine(txtDescription4.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice4.Text);
                wrtCustomerOrder.WriteLine(txtQuantity4.Text);

                wrtCustomerOrder.WriteLine(txtItemNumber5.Text);
                wrtCustomerOrder.WriteLine(txtDescription5.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice5.Text);
                wrtCustomerOrder.WriteLine(txtQuantity5.Text);

                wrtCustomerOrder.WriteLine(txtItemNumber6.Text);
                wrtCustomerOrder.WriteLine(txtDescription6.Text);
                wrtCustomerOrder.WriteLine(txtUnitPrice6.Text);
                wrtCustomerOrder.WriteLine(txtQuantity6.Text);

                wrtCustomerOrder.WriteLine(txtItemsTotal.Text);
                wrtCustomerOrder.WriteLine(txtTaxRate.Text);
    }
    finally
    {
        wrtCustomerOrder.Close();
    }
}
  101. Return to the Music Store Form
  102. Double-click the Open button and implement its event as follows:
      
    private void btnOpen_Click(object sender, EventArgs e)
{
    string strDirectory = @"C:\Musical Instrument Store\Receipts";
    string strFilename = @"C:\Musical Instrument Store\Receipts\1000.cos";

    if (txtReceiptNumber.Text == "")
        return;
    else
    {
        try
        {
            //IsNewCleaningOrder = false;
            strFilename = strDirectory + "\\" +
                          txtReceiptNumber.Text + ".cos";

            StreamReader rdrCustomerOrder = new StreamReader(strFilename);

            try
            {
                txtItemNumber1.Text = rdrCustomerOrder.ReadLine();
                txtDescription1.Text = rdrCustomerOrder.ReadLine();
                txtUnitPrice1.Text = rdrCustomerOrder.ReadLine();
                txtQuantity1.Text = rdrCustomerOrder.ReadLine();
                txtUnitPrice1_Leave(sender, e);

                        txtItemNumber2.Text = rdrCustomerOrder.ReadLine();
                        txtDescription2.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice2.Text = rdrCustomerOrder.ReadLine();
                        txtQuantity2.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice2_Leave(sender, e);

                        txtItemNumber3.Text = rdrCustomerOrder.ReadLine();
                        txtDescription3.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice3.Text = rdrCustomerOrder.ReadLine();
                        txtQuantity3.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice3_Leave(sender, e);

                        txtItemNumber4.Text = rdrCustomerOrder.ReadLine();
                        txtDescription4.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice4.Text = rdrCustomerOrder.ReadLine();
                        txtQuantity4.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice4_Leave(sender, e);

                        txtItemNumber5.Text = rdrCustomerOrder.ReadLine();
                        txtDescription5.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice5.Text = rdrCustomerOrder.ReadLine();
                        txtQuantity5.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice5_Leave(sender, e);

                        txtItemNumber6.Text = rdrCustomerOrder.ReadLine();
                        txtDescription6.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice6.Text = rdrCustomerOrder.ReadLine();
                        txtQuantity6.Text = rdrCustomerOrder.ReadLine();
                        txtUnitPrice6_Leave(sender, e);

                        txtItemsTotal.Text = rdrCustomerOrder.ReadLine();
                        txtTaxRate.Text = rdrCustomerOrder.ReadLine();

                        CalculateOrder();
                        IsNewCustomerOrder = false;
                    }
                    finally
                    {
                        rdrCustomerOrder.Close();
                    }
                }
        catch (FileNotFoundException)
        {
    MessageBox.Show("There is no customer order with that receipt number");
        }
    }
}
  103. Return to the Music Store form
  104. Double-click an unoccupied area of the form and implement the event as follows:
      
    private void MusicStore_Load(object sender, EventArgs e)
{
    btnNewCustomerOrder_Click(sender, e);
    LoadMusicStore();
    IsNewCustomerOrder = true;
}
  105. Return to the Music Store form
  106. Double-click the Close and implement its Click event as follows:
      
    private void btnClose_Click(object sender, EventArgs e)
{
    Close();
}
  107. Execute the application to test it
  108. Access the Item Editor dialog box and create a few items as follows (let the computer create the item numbers):
     
    Category Type Item Name Unit Price Picture
    Guitars Electric Gibson Les Paul Vintage Mahogany Electric Guitar 745.95 Picture
    Bass Electric 4-String Epiphone Thunderbird IV Bass 325.85 Picture
    Keyboards Synthesizers Alesis QS8.2 88 Key Synthesizer 825.50 Picture
    Guitars Acoustic Gretsch Guitars G100 Synchromatic Archtop Acoustic Guitar 595.95 Picture
    Drums Drum Set Pulse Pro 5-Piece Drum Set with Cymbals 395.95 Picture
    Keyboards Pianos Roland RD-700SX Digital Piano 2195.00  
    Accessories Cables Mogami Gold AES/EBU Interconnect Cable with Neutrik XLR 45.85  
    Guitars Acoustic-Electric Ibanez V Series V70CE Dreadnought Cutaway Acoustic-Electric Guitar 225.50  
    Guitars Electric Schecter C-1 Hellraiser Electric Guitar 650.00 Picture
    Keyboards Synthesizers Roland V Synth GT Elastic Audio Synthesizer Keyboard 2895.50 Picture
    Bass Electric 5-String Fender Jazz Bass 24 V 5-String Bass Guitar 825.50 Picture
    Guitars Electric Fender Standard Stratocaster Left-Handed Electric Guitar 425.85 Picture
    Recording Microphone MXL V63M Studio Condenser Microphone 72.95 Picture
    Guitars Acoustic Yamaha FD01S Acoustic Folk Guitar 185.95  
    Book/CD/DVD Instructional Hal Leonard Amazing Phrasing - Alto Sax (Book/CD) 18.00  
    Guitars Classical & Nylon Alvarez Artist Series AC60S Classical Acoustic Guitar 275.95 Picture
    Guitars Acoustic Washburn D100DL Acoustic Guitar 150.50 Picture
    Drums Electronic Percussion Boss DR-670 Dr. Rhythm Drum Machine 275.85 Picture
    Recording Microphone Shure SM58 Mic 95.95 Picture
    Accessories Cables Live Wire HPE325 Headphone and Extension Cable 10.95 Picture
    Bass Acoustic Fretted Ibanez AEB10E Acoustic-Electric Bass Guitar with Onboard Tuner 350.00 Picture
    Drums World Percussion Latin Percussion Conga 3-Pack with Bongos 595.95 Picture
    Keyboards Synthesizers Roland JUNO-D 61-Key Synthesizer 595.95 Picture
    Drums World Percussion Latin Percussion Aspire Conga Set with Bongos and Stand 425.50 Picture
    Recording Microphone AKG Perception 200 Condenser Microphone 160.00 Picture
     
    Musical Instrument Store: Item Category
  109. Create a few customers' orders and click Save then New Order each time. Here are examples:
     
    Musical Instrument Store: Customer Order
    Musical Instrument Store: Customer Order
  110. Close the form and return to your programming environment
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