C# ( as well as java ) has single inheritance. why? It's simpler to
implement the compiler and a lot of people thinks that multime inheritance
is not needed. if you look into google you will find the arguments both
tendences give.
In C# you can have a class implementing multiples interfaces, this give you
some of the features expected from multiple inheritance. you can also use
one or more design patterns ( facade, adapter, etc ) to help you .