Autocomplete TextBox in C#.net

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C#

For autocompletemode textbox( c#.net), i didn't get the properties like AutoCompleteMode,AutoCompleteSource,AutoCompleteCustomSource,AutoCompleteCustomSource for text box....

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web.Services;
using System.Diagnostics;
using System.Windows.Forms;
using System.ComponentModel;
using System.IO;
using System.Collections;
using System.Drawing;
using System.Text;
using System.Windows.Forms ;

This much i used...