Program in C#

Thanks a lot

Using 3rd variable

class SwapTwoNumbersUsingTempVariable
    {
        public static void Main()
        {
            Console.WriteLine("/****** Program to swap 2 numbers using temporary variable *******/");
            int a = 10, b = 20;
            Console.WriteLine(" Values before swapping a={0} , b={1}", a, b);
            int tempVar = 0; //temporary variable
            tempVar = a;
            a = b;
            b = tempVar;
            Console.WriteLine(" Values after swapping a={0} , b={1}", a, b);
            Console.ReadKey();
        }
    }

Without using 3rd variable


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Swapp_two_number_without_3rd_var
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int a;
            int b;
            a = 1;
            b = 2;
            MessageBox.Show("Original numbers are" + a + ":"+ + b);
            a = a + b;
            b = a - b;
            a = a - b;
            MessageBox.Show("Swapping numbers are" + a + ":" + +b);
        }
    }
}