auto suggest textbox in asp.net

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C#

ASP.NET

SQL-Server

I have a textbox with uid when i enter a one number showing the list what i have in the sqlserver database without using ajax,jQuery, only using asp.net,C# please anyone can help...

I'm writing a code under page load..

protected void Page_Load(object sender, EventArgs e)
    {
        string keyword = Request["k"];
        string Mode = Request["Mode"];
        string ReturnTextbox = Request["TB"];
        string MyDiv = Request["MyDiv"];
        if (keyword != null && Mode != null && keyword.Trim().Length > 0)
        {
            string sql = "";
            if (Mode == "uid")
            {
                sql = "SELECT Distinct TOP 5 uid FROM tbuser ORDER BY uid";
            }
            else
            {
                return;
            }
            DataSet ds = new DataSet();
            SqlConnection conn = new SqlConnection();
            conn = new SqlConnection(ConfigurationManager.ConnectionStrings["kuviConnectionString"].ConnectionString);

            SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
           
            adapter.Fill(ds); 
            if (ds != null && ds.Tables.Count > 0)
            {
                DataTable dt = new DataTable();
                dt = ds.Tables[0]; 

                foreach (DataRow row in dt.Rows)
                {
                    string mydata = row[0].ToString(); 
                    if (ReturnTextbox != null && ReturnTextbox.Trim().Length > 0)
                    {

                        //Write to default page, with selection options.
                        if (MyDiv == null || MyDiv.Trim().Length == 0)
                        {
                            Response.Write("<div önmouseover="\" this.style.cursor="pointer" pointer=" mode=" hold=" />                                " önclick="\" mydata="" mydiv=""><font size="2" face="Tahoma">" + mydata + "</font>" + "");
                        }
                    }
                    else
                    {
                        Response.Write("<div><font size="2" face="Tahoma">" + mydata + "</font></div>");
                    }
                }
            }
        }
    }