Answer Posted / maniprakash snstech at covai y

if you want to override the block of method form base class
you must use the method in base class as virtual and use the
method in sub class in override..

like an example:

class A //base class
{
public virtual void add()
{
// some operations...
}
}

class B : A //derived class from base class
{
public override void add()
{
//
}
}

If you call the method add() it should execute the derived
class method only not execute the base class add() method..
base class add() was blocked or hidden..

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