Autocomplete Textbox using C#.net Sqlserver

This tutorial will teach you how make a Autocomplete Textbox using C#.net Sqlserver Database.

First Step you have to make the GUI Design after that select the textbox and go to the Properties  do the couple of option i attached the screenshot image below.do the same what i attached below.

Write the code inside the Form_Load Event 

using System.Data.SqlClient;

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

        SqlConnection con = new SqlConnection("server=.; database = Bank; Integrated Security = true");

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                AutoCompleteStringCollection col = new AutoCompleteStringCollection();
                con.Open();
                string sql = "select * from account";
                SqlCommand cmd = new SqlCommand(sql, con);
                SqlDataReader sdr = null;
                sdr = cmd.ExecuteReader();
                while (sdr.Read())
                {
                    col.Add(sdr["accountno"].ToString());
                }
                sdr.Close();

                textBox1.AutoCompleteCustomSource = col;
                con.Close();
            }
            catch(Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

I have attached the video tutorial below it will help you  to do this  step by step.