I have seen many answers to similar questions, but have an additional question
I developed a web site in Visual Studio 2008. Working well on development server. When I tried to transfer it to client's server, it is giving the error: Could not load file or assembly 'System.Core, Version=3.5.0.0'
Noticed that client's server has version 2.0.0.0 and 4.0.0.0. Changing my development environment to VS2010 might work, but is there any simpler solution (something like modifying web.config file)?
In short: If I develop with 3.5.0.0, can the site be loaded to 2.0.0.0 OR 4.0.0.0 by modifying the web.config file? (It is logical that some compatibility/flexibility will be there between development and deployment set up I hope!). My web site is pretty simple, but have a MS SQL db interactions.