<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:TextBox runat="server" ID="txtItems" />
<ajaxToolkit:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
             TargetControlID="txtItems"
             ServiceMethod="GetItemList"
             CompletionSetCount="10"
             MinimumPrefixLength="1"
             EnableCaching="true" />
