Swap two integers without using a third

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Collections
Public Class Tester
Public Shared Sub Main

Dim firstValue As Integer
Dim secondValue As Integer

firstValue = 17
secondValue = 123
Console.WriteLine(“Before swap: {0}, {1}”,firstValue, secondValue)

firstValue = firstValue Xor secondValue
secondValue = firstValue Xor secondValue
firstValue = firstValue Xor secondValue
Console.WriteLine(“After swap: {0}, {1}”,firstValue, secondValue)
End Sub
End Class

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