I have installed Visual Studio 2008, ASP.net 3.5, IIS 6.0, SharePoint Services 3.0 and, of course, Return Of SmartPart v1_3.
I made all the changes in the web.config so that the SPP could support the Ajax extensions(you can find the documentation in the ReturnOfSmartPart archive). When i added an smartpart WebPart, everything worked fine, bun when i tried to add a SmartPart with Ajax web part, i have received this error: “The Web Part you attempted to add no longer exists in the Closed Web Parts Gallery. Refresh your browser to update the Web Part Page and the Gallery.” I found out that this error is due to a FileNotFoundException.

I looked once again in the web config to see if i omited to add an assembley reference or something like that. After a while i have figured out that i get this error because in the ReturnOfSmartPart.dll is a reference to System.Web.Extensions version 1.1, and not 3.5, which was the only one installed on my computer. So i have disassembled the ReturnOfSmartPart.dll and change some lines so that it supports the 3.5 version of System.Web.Extensions. I’ve uninstalled the old version of ReturnOfSmartPart.dll from the gac and put the new one, and changed in the SafeControls tag of the web.config the PublicKeyToken of the ReturnOfSmartPart Assembley to the 040795de2bd1a5e4. And everything worked well after that. You can download the assembley from here: download ReturnOfSmartPart.dll

I hope Jan Tielens won’t be mad at me because i’ve changed his assembley…you can find more thing about Smat Part on his site: www.smartpart.info or on his blog : weblogs.asp.net/jan.