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<body>
<form id="form1" runat="server">
<ajaxToolkit:ToolkitScriptManager runat="server" ID="tollkit" EnablePageMethods="True"></ajaxToolkit:ToolkitScriptManager>
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<ajaxToolkit:AutoCompleteExtender ID="autocompleteextender" TargetControlID="TextBox1" runat="server" ServiceMethod="SearchCustomers" UseContextKey="True"></ajaxToolkit:AutoCompleteExtender>
</div>
</form>
</body>