Answer 1

Method Overriding. It means that you are invoking a method from the base class and the derived class at the same time. Use virtual keywords to indicates that method can be overriden by the derived/inherited classes. And use override keyword to allow the derived class to override a method in the base class. We use method overriding to modify the methods behavior.

Method hiding is a technique where you encapsulate a method on a specific class so that it cannot be exposed directly on the real-world and with the help of access modifiers you can determine where you can only access a method.

In c# we have 5 access modifiers. We have public, private, protected, internal and protected internal.