in auto completed combo box , when i entered charactor suggesApend has to show in top row

See more:

C#

ASP.NET

Dear sir,
when i enter character , charater based list Items has to display.

For example { apple, orange, banna, grape, ,zebra}
when i type a charater "G" in my combobox in first row i have to get letters starting with "G", but rather that my cursor going to grape's position, like bottom when i entered "Z" .

<%@ Page Title="" Language="C#" MasterPageFile="~/InnerHome.Master" AutoEventWireup="true" CodeBehind="AutoCompletDemo.aspx.cs" Inherits="MOSS.AutoCompletDemo" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

    <asp:ComboBox ID="ComboBox1" runat="server" AutoCompleteMode="SuggestAppend"  CaseSensitive="false"
     >
    </asp:ComboBox>
</asp:Content>

private void FillDdl()
       {
           DataTable dt = new DataTable();
           dt = BLAutoComplete.getDdlDetails();

           ComboBox1.DataSource = dt;
           ComboBox1.DataTextField = "CategoryName";
           ComboBox1.DataValueField = "CategoryId";
           ComboBox1.DataBind();
           

       }