how to dropdownlist used to textbox

hi rasul, pls try this code for dropdownlist in TextBox...

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 WindowsFormsApplication2

{

public partial class Form1 : Form

{

AutoCompleteStringCollection namesCollection = new AutoCompleteStringCollection();

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

namesCollection.Add("Chaitanya");

namesCollection.Add("Kranthi");

namesCollection.Add("Shakti");

namesCollection.Add("Ramachandra");

namesCollection.Add("Praveen");

namesCollection.Add("Rambabu");

namesCollection.Add("RamKishore");

textBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;

textBox1.AutoCompleteSource = AutoCompleteSource.CustomSource;

textBox1.AutoCompleteCustomSource = namesCollection;

}

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