Chapter 4.LA, Problem 19E

a.

Program Plan Intro

Character Casting

Program plan:

• Create new Windows Forms Application.
• Design the form by placing the labels, textbox, and button and then change their name and properties.
• Inside the “Display” button,
  • Declare required variables.
  • Get the “ID” from the user.
  • Check the “ID”.
    • Print the message.
    • Otherwise, print the corresponding message.
• Inside the “Clear” button,
  • Clear the form.
• Inside the “Exit” button,
  • Close the form.

b.

Explanation of Solution

Program:

'Definition of frmMain

Public Class frmMain

  'Definition of button display

Private Sub btnDisplay_Click(sender As Object, e As EventArgs) Handles btnDisplay.Click

  'Declare the ID as string

  Dim ID As String

  'Get the ID

  ID = txtId.Text

  'Check the ID

If ID = "AB12" OrElse ID = "XY59" OrElse ID = "TV45" Then

  'Print the message

  lblMsg.Text = "Valid ID"

  Else

  'Otherwise, print the message

  lblMsg...