Did you try to check what MSDN says about the Select method. I wonder, why people do not check the documentation before relying on others to resolve the problem.

Your first reference should be MSDN. After all MS is the one who created .NET Framework so their documentation should be the one that you should refer. And if you still don't understand something you can always post it here.

You should also use CODE tags. Refer our FAQ or look at my signature.