Swap number in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Programone
{
    class Program
    {    
        static void Main(string[] args)
        {
            int num1, num2, temp;
            Console.WriteLine("Enter number");
            num1 = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter number");
            num2 = int.Parse(Console.ReadLine());

            temp = num1;
            num1 = num2;
            num2 = temp;
            Console.WriteLine(num1);
            Console.WriteLine(num2);
            Console.ReadLine();        

        }
    }
}


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Programone
{
    class Program
    {       
        static void Main(string[] args)
        {
            int num1, num2, temp;
            Console.WriteLine("Enter number");
            num1 = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter number");
            num2 = int.Parse(Console.ReadLine());
                      
            num1 = num1+num2;//15
            num2 = num1 - num2;
            num1 = num1 - num2;
            
            Console.WriteLine(num1);
            Console.WriteLine(num2);
            Console.ReadLine();           

        }
    }
}



using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Programone
{
    class Program
    {       
        static void Main(string[] args)
        {
            int num1, num2, temp;
            Console.WriteLine("Enter number");
            num1 = int.Parse(Console.ReadLine());
            Console.WriteLine("Enter number");
            num2 = int.Parse(Console.ReadLine());
                      
            num1 = num1*num2;//50
            num2 = num1/num2;
            num1 = num1/num2;
            
            Console.WriteLine(num1);
            Console.WriteLine(num2);
            Console.ReadLine();           

        }
    }
}


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