无法获取所选项目的ID

Question

我正在使用下面的代码从文本框中获取所选文本，并使用自动填充扩展程序。如何从数据库中检索Items ID？有没有办法在下面的代码中添加一些东西来获取项目ID？谢谢

  <script language="javascript" type="text/javascript">
    function getSelected(source, eventArgs) {

        document.getElementById('<%=DetailsTextBox.ClientID %>').value = eventArgs.get_value();
    }
</script>

<asp:TextBox ID="TextBox1" runat="server" Height="24px" Width="486px" 
            AutoPostBack="True"></asp:TextBox>
        <asp:AutoCompleteExtender ID="AutoCompleteExtender" runat="server" 
    DelimiterCharacters="" Enabled="True" ServicePath="AutoComplete.asmx" 
            ServiceMethod="GetCompletionList" TargetControlID="TextBox1" 
    MinimumPrefixLength="2" UseContextKey="true" ContextKey="StateDropDown"
            CompletionListElementID="autocompleteDropDownPanel" 
            onclientitemselected="getSelected()">
</asp:AutoCompleteExtender>