Error: Unable to cast object of type 'X.Y.C.1' to 'X.Y.C.2'.

Hello,

I three classes A, B and C where, B is derived from A and C is derived from both A & B. I created an object of class C (Obj) and initialized it correctly by calling constructors of A and B.

Class A and B have some functions (static) which access other functions which are a part of some .NET assemblies installed on my computer.

When I try to use this object Obj to access the static functions of A and B (which have calls to functions that reside in the .NET assemblies) I am receiving this above error.

Can someone kindly help me understand what might be going wrong?.

Also can anyone kindly let me know where I can find the function definitions that exist in the .NET assemblies on my computer? I have little experience in this regard and help will be greatly appreciated.