How to use FOR NEXT loop in vb.net

For next is used for programming code to be repeat a task for more than one times or repeat a task till you reach a condition, use loop statements to achieve your desired results.

FOR NEXT Loop, FOR EACH Loop, WHILE Loop and DO WHILE Loop are the commonly used loops

FOR NEXT Loop:

The FOR NEXT Loop , execute the loop body the source code within For Next code block to a fixed number of times.

For  variable  = [start_value] to [End_value] step

‘Body of the loop

Next [variable]

Here

Variable  à The counter for the loop to repeat the steps.

Star_Value à The starting value assign to counter variable .

End_Value : When the counter variable reach end value the Loop will stop .

Body  of the loopà The source code between loop body

 

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim variable As Integer

        Dim start_Val As Integer

        Dim end_Val As Integer

        start_Val = 1

        end_Val = 5

        For variable = start_Val To end_Val

            MsgBox("Message Box Shows " & variable & " Times ")

        Next variable

    End Sub

End Class

When you execute this program, It will show message box five time and each time it shows the counter value.

If you want to Exit from FOR NEXT Loop even before completing the loop Visual Basic.NET provides a keyword Exit to use within the loop body.

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim variable As Integer

        Dim start_Val As Integer

        Dim end_Val As Integer

        start_Val = 1

        end_Val = 5

        For variable = start_Val To end_Val

            MsgBox("Message Box Shows " & variable & " Times ")

            If variable = 3 Then

                Exit For

            End If

        Next variable

    End Sub

End Class

When you execute this program, it will show message box three times and it will exit the for loop