CD Publisher

In this exercise, we will develop an application for a small CD publishing company. The owner wants the prices to be calculated so a customer would get a discount if he orders more. To attract customers and encourage them to order more, she has decided to fix the prices so that the customer would pay:

• \$20/CD if he orders less than 20 units
• \$15/CD if he orders less than 50 units
• \$12/CD if he orders less than 100 units
• \$8/CD if he orders less than 500 units
• \$5/CD if he orders more than 500 units
1. Start Visual Studio
2. Create a new Visual C# Windows Application and name it CDPublisher
3. Design the form as follows:

 Control Name Text Other Properties Label Number of CDs: NumericUpDown updQuantity Maximum: 10000 TextAlign: Center Label Unit Price: TextBox txtUnitPrice 0 TextAlign: Right Label Total Price: TextBox txtTotalPrice 0 TextAlign: Right Button btnClose Close
4. Double-click the Close button and implement it as follows:

 ```private void btnClose_Click(object sender, System.EventArgs e) { Close(); }```
5. Double-click the up down button to access its OnChange() event and implement it as follows:

 ```private void updQuantity_ValueChanged(object sender, System.EventArgs e) { int Quantity; double UnitPrice, TotalPrice; Quantity = Decimal.ToInt32(updQuantity.Value); if( Quantity < 20 ) UnitPrice = 20; else if( Quantity < 50 ) UnitPrice = 15; else if( Quantity < 100 ) UnitPrice = 12; else if( Quantity < 500 ) UnitPrice = 8; else UnitPrice = 5; TotalPrice = Quantity * UnitPrice; txtUnitPrice.Text = UnitPrice.ToString("C"); txtTotalPrice.Text = TotalPrice.ToString("C"); }```
6. Test the application
7. Close it