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C# Program to Swap two Numbers

using System;

public class SwapNumbers  
    public static void Main(string[] args)  
        int  num1=10, num2=20, swap;            
        Console.WriteLine("Before swap A: "+num1+" B: "+num2);    
        swap = num1;
		num1 = num2;
		num2 = swap;
        Console.Write("After swap A: "+num1+" B: "+num2);
Before swap A: 10 B: 20
After swap A: 20 B: 10

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