VB.NET: ByVal Versus ByRef Example Or Difference between Byval and ByRef

Hi friends.in this article i will explain about ByVal Versus ByRef Example Or Difference between Byval and ByRef.

By Value and By Reference are two ways of passing arguments to a method. If you pass a value by value, means you send a copy of the value to a method and so changes made to that copy wont affect the original variable in a caller method.

But when you pass them by reference, means you pass a reference to the same value in a memory, so any changes done in the called method, will affect the sender method variable passed . You use By Ref if you need the changes in the called method to affect the variable in the caller method. It is like returning the changes.

Partial Class _ Default     Inherits System.Web.UI.Page     Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load         Dim y As Integer = 1         ex(y)         Response.Write(y & "<br/>")         Dim y2 As Integer = 2         ex2(y2)         Response.Write(y2)     End Sub     Protected Sub ex(ByVal x As Integer)         x = 10     End Sub     Protected Sub ex2(ByRef x As Integer)         x = 10     End Sub End Class

The output of y after calling a method will be 1 because changes in the called method does not affect there.But the output y2 after calling a method will be 10 because changes in the called method does effect there.