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How to use FOR EACH loop in VB.NET

Whenever you face a situation in programming to repeat a task for several times (more than one times ) or you have to repeat a task till you reach a condition, in these situations you can 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 in Visual Basic.NET 2005 ( VB.NET 2005) .

For Each Loop

FOR EACH Loop usually using when you are in a situation to execute every single element or item in a group (like every single element in an Array, or every single files in a folder or , every character in a String ) , in these type of situation you can use For Each loop.

  
For Each [Item] In [Group]
   [loopBody]

Next [Item]

Item : The Item in the group

Group : The group containing items

LoopBody : The code you want to execute within For Each Loop

Let's take a real time example , if you want to display the each character in the website name "HTTP://NET-INFORMATIONS.COM" , it is convenient to use For Each Loop.

  
1. siteName = "HTTP://NET-INFORMATIONS.COM"
2. For Each singleChar In siteName
3.	MsgBox(singleChar)

4. Next

Line 1: Assigning the site name in a variable

Line 2: This line is extracting the single item from the group

Line 3: Loop body

Line 4: Taking the next step




Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, 
	ByVal e As System.EventArgs) Handles Button1.Click
        Dim siteName As String
        Dim singleChar As Char
        siteName = "HTTP://NET-INFORMATIONS.COM"
        For Each singleChar In siteName
            MsgBox(singleChar)
        Next
    End Sub
End Class

When you execute this program you will get each character of the string in Messagebox.


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