how to create autocomplete combobox in ASP.Net ?

private void Form1_Load(object sender, EventArgs e)
{
 AutoCompleteStringCollection namesCollection = new AutoCompleteStringCollection();
 SqlDataReader dReader;
SqlConnection conn = new SqlConnection();
conn.ConnectionString = strConnection;
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandType = CommandType.Text;
cmd.CommandText =
"Select distinct [Name] from [Names]" +
" order by [Name] asc";
conn.Open();
dReader = cmd.ExecuteReader();
if (dReader.HasRows == true)
{
while (dReader.Read())
namesCollection.Add(dReader["Name"].ToString());

}
else
{
MessageBox.Show("Data not found");
}
dReader.Close();


txtName.AutoCompleteCustomSource = namesCollection;

}
}