Clear TextBox after value is selected in ASP.Net AJAX AutoCompleteExtender

I have used the reference of the article ASP.Net AJAX AutoSuggest TextBox Example

For the AutoComplete, I have made use of OnClientItemSelected event for clearing the textbox

<div>
    <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true">
    </asp:ScriptManager>
    <asp:TextBox ID="txtContactsSearch" runat="server"></asp:TextBox>
    <cc1:AutoCompleteExtender ServiceMethod="SearchCustomers" MinimumPrefixLength="2"
        CompletionInterval="100" EnableCaching="false" CompletionSetCount="10" TargetControlID="txtContactsSearch"
        ID="AutoCompleteExtender1" runat="server" FirstRowSelected="false" OnClientItemSelected="OnClientItemSelected">
    </cc1:AutoCompleteExtender>
</div>
<script type="text/javascript">
    function OnClientItemSelected(sender, args) {
        $get("<%=txtContactsSearch.ClientID %>").value = "";
    }
</script>