Allow Conditional attribute also to non void methods

Variance for classes

Null coalescing operator for strings

switch statement should be simplified by using commas to separate cases, using braces to drop the break statement and support types [c#]

[C#] Simplify foreach statements when using linq to allow using where and order by in the language.

[C#] detect infiniate call to same function.

[C#] Warn for strings using $ prefix without any actual {} code.

Extend 'using' keyword functionality (C#)

C#: Implement "with" Keyword from VB.NET

Add VS IDE support for IntermediateOutputPath in C# .csproj project files