What is ByVal and ByRef in vb.net.Please explain with examples.

Question

Hi all What is ByVal and ByRef in vb.net.Please explain with examples. Thanks

Satyapriya Nayak · Answer

Hi Kundan ByVal:- means passing a copy of a variable to your Subroutine. You can make changes to the copy and the original will not be altered. ByRef:- means that you are not handing over a copy of the original variable but pointing to the original variable.Here original value will be changed. Ex:- Dim x y As Integer Private Sub Button1_Click(ByVal sender As System.Object ByVal e As System.EventArgs) Handles Button1.Click x = 20 y = 30 MsgBox(original value= & x &    & y) change1(x) change2(y) MsgBox(changed value= & x &    & y) End Sub Sub change1(ByVal x As Integer) x = x + 10 End Sub Sub change2(ByRef y As Integer) y = y + 10 End Sub Result original value= 2030 changed value= 2040 Thanks