How to set Selected Value for AJAX Cascading DropDown in ASP.Net

Hi,

<asp:DropDownList ID="ddlModuleName" runat="server" ClientIDMode="Static">
             </asp:DropDownList>
              <cc1:CascadingDropDown ID="cdlModule" TargetControlID="ddlModuleName" PromptText="Select Module" PromptValue="0" ServicePath="~/controls/WebService.asmx" ServiceMethod="GetModules" runat="server" Category="ModuleID" LoadingText="Loading..."  />

I am binding the dropdownlist by using ajax cascading drop down now i need to preselect the dropdown value in code behind page in page load (for update operation) is it possible