Namespace aliasing and extension methods Namespace c# alias | Mar 11, 2011 • Chandermani Arora One of the interesting thing that i learned today is, namespace aliasing can break extension methods declared in the name space.To safeguard against this situation add the same namespace again without alias. For exampleusing alias=X.Y.Z;should be changed tousing alias=X.Y.Z;using X.Y.Zand everything works,Happy Coding,Chandermani