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Difference Between ByVal And ByRef

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What is the main difference between ByVal and ByRef? Where are they used in Visual Basic Programming? Explain your answers with examples.




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    3 Answers

    1. Anonymous
      • ByVal passes a copy of the variable, changes made within the function do not affect the original variable.
      • ByRef passes a reference to the variable, changes made within the function affect the original variable.

      Choosing between ByVal and ByRef depends on whether you want the called function to have the ability to modify the original variable or not.

    3. Anonymous

      Sub Main()
      Dim message As String = “Hello”
      AppendExclamationByVal(message)
      Console.WriteLine(message) ‘ Output: Hello
      End Sub

      Sub AppendExclamationByVal(ByVal str As String)
      str = str & “!”
      End Sub

    4. Anonymous

      Sub Main()
      Dim message As String = “Hello”
      AppendExclamationByRef(message)
      Console.WriteLine(message) ‘ Output: Hello!
      End Sub

      Sub AppendExclamationByRef(ByRef str As String)
      str = str & “!”
      End Sub

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