I want to convert my .NET Website that is currently in .NET Framework version 3.5 SP 1 to 4.0. Now you get a conversion wizard when you open a VS 2008 solution in VS 2010. T
To amend the Framework target, i went to the property pages of the site > build tab > updated the target framework. It re-built the web site successfully for me.
AFAIK, The wizard doesn't do anything that switching target type in the project won't do. You might not get the option to back up, but you're already doing versioning, right?
The wizard converts solutions and projects from previous VS versions to the current one. It will not open again, because you already converted it to VS2010.
To change to .NET 4.0: