I think you need to make ref struct SInside access level "public" due to the usage of generics in STL/CLR. However, if this ref struct SInside is only going to be accessed within the same assembly, you can make it's access level "internal" or "protected public". "We make a living by what we get, we make a life by what we give." --Winston Churchill modified on Thursday, August 28, 2008 3:39 PM