hi all, hope in your help.

I worked with this tutorial http://www.asp.net/ajaxlibrary/act_A...te_Simple.ashx

I've problem because when in textbox selected one value I need update the gridview but the gridview not update, can you help me?

Code:
    [System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
    public static string[] GetCompletionList(string prefixText, int count, string contextKey)
    {
        OdbcConnection myConnectionString =
           new OdbcConnection(ConfigurationManager.ConnectionStrings["ConnGCCom"].ConnectionString);

        DataSet ds = new DataSet();
        DataTable dt = new DataTable();

        OdbcCommand cmd = new OdbcCommand();
        cmd.Connection = myConnectionString;
        cmd.CommandType = CommandType.Text;

        cmd.CommandText = "SELECT ListNumber ";
        cmd.CommandText = cmd.CommandText + " FROM tbl_X ";
        cmd.CommandText = cmd.CommandText + " WHERE ListNumber LIKE CONCAT('%',?,'%') ";
        cmd.CommandText = cmd.CommandText + " GROUP BY ListNumber;";
        cmd.Parameters.AddWithValue("?", prefixText);

        try
        {
            myConnectionString.Open();
            cmd.ExecuteNonQuery();
            OdbcDataAdapter da = new OdbcDataAdapter(cmd);
            da.Fill(ds);
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            myConnectionString.Close();
        }

        dt = ds.Tables[0];
        List<string> txtItems = new List<string>();
        String dbValues;

        foreach (DataRow row in dt.Rows)
        {
            dbValues = row["ListNumber"].ToString();
            dbValues = dbValues.ToLower();
            txtItems.Add(dbValues);
        }

        return txtItems.ToArray();
    }




    protected void decoderViewSource()
    {
        SQL = "SELECT * FROM ";
        SQL = SQL + "	tbl_X ";
        SQL = SQL + "WHERE ";
        SQL = SQL + "	1 ";

        if (ListNumber.Text != "")
        {
            SQL = SQL + " AND ListNumber ='" + ListNumber.Text + "' ";
        }

        Response.Write(SQL);

        try
        {
            OdbcDataAdapter adapter = new OdbcDataAdapter(SQL, myConnectionString);
            adapter.Fill(ds);
            DataView dv = new DataView();
            dv = ds.Tables[0].DefaultView;
            DecoderView.DataSource = dv;
            DecoderView.DataBind();
        }
        catch (Exception ex)
        {
            throw new Exception(ex.Message);
        }
        finally
        {
            myConnectionString.Close();
        }
    }


    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            decoderViewSource();
        }
    }



                <asp:TextBox ID="ListNumber" runat="server" AutoPostBack="true"></asp:TextBox>
                <asp:AutoCompleteExtender ID="AutoCompleteExtender1" TargetControlID="ListNumber"
                    runat="server" ServiceMethod="GetCompletionList" UseContextKey="True" />