Hello,

you can use .NET 3.5 (AJAX 3.5.0.0) package in current kentico version, by following procedure, describing how to prepare package of necessary dlls for running Kentico CMS with .NET 3.5 (AJAX 3.5.0.0):

1. Go to the ASP.NET AJAX Toolkit Release page - http://www.codeplex.com/AjaxControlToolkit/Release/ProjectReleases.aspx?ReleaseId=4923

2. Download the latest version of the toolkit for .NET Framework version 3.5 (choose one):

a. AjaxControlToolkit-Framework3.5-NoSource.zip.

b. AjaxControlToolkit-Framework3.5.zip (includes source code).

3. In Windows Explorer, right-click the zip file and choose “Extract All…” to extract the contents to an “AjaxControlToolkit-Framework3.5” folder in the same directory.

4. Please open Visual Studio (no matter if 2005 or 2008) and Open Solution.

5. Delete all dlls from 'Bin' folder starting with "CMS". Please delete also 'AjaxControlToolkit.dll', 'System.Web.Extensions.dll' and 'System.Web.Extensions.Design.dll'. And now you need to re-add the CMS dlls from the package (See also).

6. Now right-click the 'Bin' folder, choose 'Add Existing Item' and find 3 files located at: 'AjaxControlToolkit-Framework3.5\SampleWebSite\Bin\AjaxControlToolkit.dll',
'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Web.Extensions.dll' and
'C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.5\System.Web.Extensions.Design.dll'

7. When you've already added these 3 files you can add references on the dlls by right-clicking on 'Bin' folder and choose 'Add Reference'. Go through the process of a adding references.

8. In the end please rebuild solution in 'release' mode.

9. Zip all dlls files from 'Bin' folder.

Package is ready now.

Best Regards,
Radek Macalik