For people that cant find “System.Web” at .Net References, this might be the answer:
“you need to right-click the project -> properties -> then change the “Target framework” which will probably be “.NET Framework 4 Client Profile” to just “.NET Framework 4”.
The answer was given by Tinister (thanks) as a reply to a previuos post. But I thought it was a little bit hidden at his original post. So i put it here to make it easer to be seen. Hope it helps.