Closed Issue: CascadingDropDown Method error 500 When Exceeding 814 Items [15184]

Hi,

I've been searching and searching and just can't find a solution for this. It looks like the ajaxToolkit cascading dropdown control can only handle 814 items. Any more returns the error "Method error 500" in the list. We have a few lists that have between 1300 and 2000 items which are handled just fine by the regular dropdown lists.

We're developing in Visual Studio 2008 under Windows 2003 Advanced Server, .NET Framework 2.0 - 3.5 and the have the latest AJAX stuff installed. Everything works fine until we exceed the 814 items.

Please let me know if there's any other info I need to provide.

I did try a possible solution from another post I found here, but that didn't work because the attribute maxJsonLength was not recoginzed:
<system.web.extensions>
<scripting>
<webServices>
<!-- Customize maxJsonLength -->
<jsonSerialization maxJsonLength="5000000"></jsonSerialization></webServices>
<!-- Optional -->
<scriptResourceHandler enableCompression="true" enableCaching="true" />
</scripting>
</system.web.extensions>