c# - System.Object being the base class

Question

This question may be usual for many, i tried for an hour to understand the things but getting no proper explanation.

MSDN says, System.Object is the ultimate base class of all classes in the .NET Framework; it is the root of the type hierarchy.

When C# doesn't allow multiple inheritance, how can I inherit, say a Class A to Class B. ? Because all classes, already inherits from System.Object right? Here I am talking about the normal inheritance.

Class A { --- }
Class B : A { --- }

Please, clear my doubts. Thank you.

Update:

Again, My doubt is about, All classes inheriting from System.Object, then that would make Class B having Class A as well as System.Object. From my above example

Answer 1

Correct, C# only allows single inheritence. The System.Object class is inherited implicitly by your Class A. So Class B is-a A, which is-a System.Object. This is taken care of by the compiler so you don't need to explicitly say that Class A : System.Object (though you can if you want).