Autocomplete not working

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ASP.NET

webservice

i have used below coding to fetch name from database when user enter alphabets in the textbox(Note: when user enter A, name starts with A all the names should be shown). In below code SERVICE not working i dont knw wats the problem. i tried with debugging also but not working. where i have done the mistake, help me out

<asp:UpdatePanel ID="upane1" runat="server">
                      <ContentTemplate>
                      <asp:TextBox ID="txtsrchitem" runat="server" CssClass="txt_box"></asp:TextBox>

<cc1:AutoCompleteExtender runat="server" TargetControlID="txtsrchitem"
                           ServicePath="~/SERVICES/Service02.svc" ServiceMethod="Loadtxtitem" EnableCaching="true" MinimumPrefixLength="1"
                           CompletionInterval="500" CompletionSetCount="12" CompletionListCssClass="AutoExtender"
                           CompletionListItemCssClass="AutoExtenderList" CompletionListHighlightedItemCssClass="AutoExtenderHighlight"
                           CompletionListElementID="divwidth">
                        </cc1:AutoCompleteExtender>
                        <ajax:TextBoxWatermarkExtender TargetControlID="txtsrchitem" ID="twsrchitem" runat="server" WatermarkText="Enter Item Name">
                        </ajax:TextBoxWatermarkExtender>
                        </ContentTemplate>
                        </asp:UpdatePanel>