Using Text and Value Pairs with the AutoCompleteExtender : AutoComplete « Ajax « ASP.NET Tutorial

<%@ Page Language="C#" %>
<%@ Register TagPrefix="ajax" Namespace="AjaxControlToolkit"
 Assembly="AjaxControlToolkit" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Linq" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    [System.Web.Services.WebMethod]
    public static string[] GetSuggestions(string prefixText, int count)
    {
        MyDatabaseDataContext db = new MyDatabaseDataContext();
        List<Product> products = db.Products
            .Where( m => m.Title.StartsWith(prefixText) )
            .OrderBy( m => m.Title )
            .Take(count)
            .ToList();
        return products
            .Select( m => AutoCompleteExtender.CreateAutoCompleteItem(
               m.Title, m.Id.ToString()))
            .ToArray();
    }

    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        lblSelectedProductTitle.Text = txtProductTitle.Text;
        lblSelectedProductId.Text = ace1Value.Value;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>AutoComplete Page Method</title>
    <script type="text/javascript">

    function ace1_itemSelected(sender, e)
    {
        var ace1Value = $get('<%= ace1Value.ClientID %>');
        ace1Value.value = e.get_value();
    }

    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <asp:ScriptManager ID="sm1" runat="server" />

    <asp:Label
        id="lblProductTitle"
        Text="Product:"
        AssociatedControlID="txtProductTitle"
        Runat="server" />
    <asp:TextBox
        id="txtProductTitle"
        AutoComplete="off"
        Runat="server" />
    <ajax:AutoCompleteExtender
        id="ace1"
        TargetControlID="txtProductTitle"
        ServiceMethod="GetSuggestions"
        MinimumPrefixLength="1"
        OnClientItemSelected="ace1_itemSelected"
        FirstRowSelected="true"
        runat="server" />
    <asp:HiddenField
        id="ace1Value"
        Runat="server" />
    <asp:Button
        id="btnSubmit"
        Text="Submit"
        OnClick="btnSubmit_Click"
        Runat="server" />

    <br /><br />

    Title:
    <asp:Label
        id="lblSelectedProductTitle"
        runat="server" />

    <br /><br />
    Primary Key:
    <asp:Label
        id="lblSelectedProductId"
        runat="server" />


    </div>
    </form>
</body>
</html>

20.4.AutoComplete
	20.4.1.	Using the AutoComplete Control
	20.4.2.	Using the AutoCompleteExtender with a Web Service Method
	20.4.3.	Using Text and Value Pairs with the AutoCompleteExtender