Description

After an item has been selected, to make a different selection, the user would click another. The new clicked item becomes selected or highlighted; the previously selected item looses its highlighting attribute. The user can also change the selection by pressing the up or down arrow keys.

List boxes are categorized in two types: single and multi-selection. The second category allows a user to select more than one item by pressing Ctrl to select items at random or by pressing Shift to select items in a range.

One of the main reasons for using a list box is to display a list of items to the user. Sometimes the list would be very large. If the list is longer than the available client area of the control, the control would be equipped with a scroll bar that allows the user to navigate up and down to access all items of the list. You will have the option of deciding how many items to display on the list.

1. Start Microsoft Visual C# and create a new Windows Application named MusicalInstrumentStore1
2. In the Solution Explorer, right-click Form1.cs and click Rename
3. Type MusicStore.cs and press Enter

To support list boxes, the .NET Framework provides the ListBox class. At design time, to add a list box to an application, from the Common Controls section of the Toolbox, click the ListBox control and click the form or the control that will host it. To programmatically create a list box, declare a variable of type ListBox, use the new operator to allocate memory it, and add it to the Controls property of its eventual parent.

using System;
using System.Drawing;
using System.Windows.Forms;

public class Exercise : System.Windows.Forms.Form
{
    ListBox lbxFamily;

    public Exercise()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        lbxFamily = new ListBox();

        Controls.Add(lbxFamily);
    }
}

public class Program
{
    static int Main()
    {
        System.Windows.Forms.Application.Run(new Exercise());
        return 0;
    }
}

In our applications, the names of the list-based controls will be in plural. This is not a rule and it is not based on any preconceived standard.

1. Design the form as follows:
    

   Control Text Name Other Properties GroupBox Musical Instrument Selection     Label Categories     Label Types     Label Items     ListBox   lbxCategories   ListBox   lbxTypes   ListBox   lbxItems   GroupBox Selected Items     Label   Part #   Label   Description   Label   Unit Price   Label   Qty   Label   Sub Total   TextBox   txtPartID1   TextBox   txtDescription1   TextBox 0.00 txtUnitPrice1 TextAlign: Right TextBox 0 txtQantity1 TextAlign: Right TextBox 0.00 txtSubTotal1 TextAlign: Right Button Rmv btnRemove1   TextBox   txtPartID2   TextBox   txtDescription2   TextBox 0.00 txtUnitPrice2 TextAlign: Right TextBox   txtQuantity2 TextAlign: Right TextBox 0.00 txtSubTotal2 TextAlign: Right Button Rmv btnRemove2   TextBox   txtPartID3   TextBox   txtDescription3   TextBox 0.00 txtUnitPrice3 TextAlign: Right TextBox 0 txtQuantity3 TextAlign: Right TextBox 0.00 txtSubTotal3 TextAlign: Right Button Rmv btnRemove3   TextBox   txtPartID4   TextBox   txtDescription4   TextBox 0.00 txtUnitPrice4 TextAlign: Right TextBox   txtQuantity4 TextAlign: Right TextBox 0.00 txtSubTotal4 TextAlign: Right Button Rmv btnRemove4   TextBox   txtPartID5   TextBox   txtDescription5   TextBox 0.00 txtUnitPrice5 TextAlign: Right TextBox 0 txtQuantity5 TextAlign: Right TextBox 0.00 txtSubTotal5 TextAlign: Right Button Rmv btnRemove5   TextBox   txtPartID6   TextBox   txtDescription6   TextBox 0.00 txtUnitPrice6 TextAlign: Right TextBox 0 txtQuantity6 TextAlign: Right TextBox 0.00 txtSubTotal6 TextAlign: Right Button Rmv btnRemove6   Button Close btnClose   Label   Order Total:   TextBox 0.00 txtTotalOrder TextAlign: Right

2. Save the form