有用的新.net（3.0,4.0）技术功能

Previously it was .net 2.0 which is the big change in .net developement. many developers are working mostly on this. Presently microsoft has introduced .net 3.0 and yet its next version .net 4.0. So the next version is going to be major change in .net development.Previously it was .net 2.0 which is the big cha