How to use Delegate in c#.net

How to Use DELEGATE in C#.NET

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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 USE_DELEGATE

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        //Create delegate 

        public delegate void delegatemessageshow(string msg);

        private void Form1_Load(object sender, EventArgs e)

        {

        }

        // Create method same return type of delegate it must

        public void showmessage(string s)

        {

            MessageBox.Show(s);

        }

        private void btndel_Click(object sender, EventArgs e)

        {

            // Create instance of delegate and call method

            delegatemessageshow dlm = new delegatemessageshow(showmessage);

            dlm("Hi Delegate");

        }

    }

}