In this article, I will
explain you about Loops in Visual Basic .NET
For Loop
For loop enables you to execute a block of
statements a certain number of times. The For loop in Visual Basic .NET
requires you to provide a top index, a bottom index which counts the number of
loop iterations as the loop executes. Each time in the top index is incremented
by step and when top index is equal to bottom index, the loop ends. It is a
powerful and expressive way to iterate through numbers.
Example:
Imports System.Console
Module Module1
Sub Main()
Dim A As Integer
For A = 0
To 4
System.Console.WriteLine("This
is For Loop")
Next A
Read()
End Sub
End Module
The Output of above program is:
While Loop
The while loop is a very clear loop structure, but until the condition against
which it tests is remain true While loop keep executing. Some time it can lead
to infinite loops if you are not careful.
Example:
Imports System.Console
Module Module1
Sub Main()
Dim A, B As Integer
A = 0
B = 6
While B > 5
B -= 1
A += 1
End While
System.Console.WriteLine("The
While Loop rans " & B & " times")
Read()
End Sub
End Module
The Output of above
program is:
Do Loop
When we want to execute a fixed block of
expression indefinite number of time then we use Do loop. While or until the
condition in the expression is true, the Do loop keeps executing the expression.
While and Until
are the two keywords which we use with the do loop,
Exit Do statement is use to exit the loop at any moment.
Example:
Imports System.Console
Module Module1
Sub Main()
Dim arr As String
Do Until
arr = "Atul"
System.Console.WriteLine("What
are you doing")
Loop
Read()
End Sub
End Module
The Output of above
program is:
Summary
I hope this article help you to understand about Loops in Visual Basic .NET