Question

Programming Tasks:

1. Write a program that will determine if one or both textboxes for username and

password contains empty string. If username or/and password is/are empty then it will

display a message that username and password is required. Otherwise, it will determine

if it correct or incorrect.

2. Write a program implementing Select Case statement that evaluates a character either a

vowel or a consonant.

3. Write a program implementing While loop statement, any Do loops statement, any For

loops statement that display your Name, School, Course and Year level 10 times with

the use of message box.

Answer 1

Program 1

Public Class Form1


    Private Sub btnCheck_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCheck.Click
        If txtUserName.Text = String.Empty Then
            MessageBox.Show("Username is required.")
            Return
        End If
        If txtPassword.Text = String.Empty Then
            MessageBox.Show("Password is required.")
            Return
        End If


        If txtUserName.Text = "admin" And txtPassword.Text = "1111" Then
            MessageBox.Show("Correct")
        Else
            MessageBox.Show("Incorrect")
        End If


    End Sub
End Class

Program 2.

Module Module1


    Sub Main()




        Console.Write("Enter the letter: ")
        Dim letter As String = Console.ReadLine()




        Select Case letter.ToUpper()
            Case "A", "E", "I", "O", "U"
                Console.WriteLine("Vowel")
            Case Else
                Console.WriteLine("Consonant")
        End Select


        Console.ReadLine()
    End Sub


End Module


Program 3.
Public Class Form1


    Private Sub btnCheck_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCheck.Click
        Dim info As String = ""
        Dim counter As Integer = 0


        'While loop statement
        While counter < 10
            info += "Your Name: Your Name" + Environment.NewLine 'School, Course and Year level"
            info += "Your School: 45" + Environment.NewLine
            info += "Your Course: VB.NET" + Environment.NewLine
            info += "Your Year level: 3" + Environment.NewLine + Environment.NewLine
            counter += 1
        End While
        MessageBox.Show(info)
        'Do loops statement
        info = ""
        counter = 0
        Do Until counter >= 10
            info += "Your Name: Your Name" + Environment.NewLine 'School, Course and Year level"
            info += "Your School: 45" + Environment.NewLine
            info += "Your Course: VB.NET" + Environment.NewLine
            info += "Your Year level: 3" + Environment.NewLine + Environment.NewLine
            counter += 1
        Loop
        MessageBox.Show(info)
        'For loops statement that display  10 times with the use of message box.
        For i As Integer = 0 To 9
            info += "Your Name: Your Name" + Environment.NewLine 'School, Course and Year level"
            info += "Your School: 45" + Environment.NewLine
            info += "Your Course: VB.NET" + Environment.NewLine
            info += "Your Year level: 3" + Environment.NewLine + Environment.NewLine
        Next
        MessageBox.Show(info)


    End Sub
End Class