Develop a Windows Forms app to calculate and display used computer charges based on CPU cost, monitor cost, and additional costs such as an optional yearly maintenance and a warranty. All sales must include a tax of 6.25%. CPU and monitor models are to be selected from a comboBox control (model names can be added based on what is currently in inventory). Optional charges such as a yearly maintenance fee of $250 or a warranty of $125.00 can be added to the purchase. Final charges should display what CPU and monitor was selected and the cost, any additional optional charges, subtotal, sales tax, and total charges. These charges should not be able to be changed by the user. Visual Basic Topics and Control Objects: Windows Form, Variable and Data Types, Data Assignment, Conditional Statements, Checkbox Control, Group Box Control, ToolTip Control, Button Control, TextBox Control, PictureBox control, Label Control, MessageBox, exception handling General Project Requirements 1. In the source code, make sure to include your name, class, and date
2. The Windows Form should be easy to understand using appropriate Label and ToolTip controls to help the user navigate through the application (see sample Form and sample video)
3. Comments should be placed throughout your VB code. Variables and control objects should follow common naming conventions (see common naming conventions handout)
4. Make sure the Windows Form has Text (le "ACE Used Computer Sales...")
5. Use ComboBox controls to select CPU and Monitor models
6. Use Textbox controls to enter the costs
7. Use Label controls to indicate company name, CPU cost, etc.
8. Use TextBox controls to display all the charges (Set Enable = False to 'grey out the textbox)
9. Use Error Handling (Try...Catch...Finally) to account for common errors. For example, if a user enters incorrect data types into the cost textboxes a. Display a message (using a MsgBox)to the user where necessary
10. Use a GroupBox control to contain the additional charges (CheckBox controls) and Charges (CPU, Monitor, Tax, etc.)
11. Use a PictureBox control to display an image on the Windows Form
12. Provide the ability for a user to clear all input/outputs displayed
13. Provide the user with an app 'Exit' button