I have a Base class with a method that a child class will almost always override. However, instead of replacing the base class' method entirely, I would like for whatever is derived in the child class to be added to what is already in the base class.

For Example:

class BaseClass

public string str()
{
   var string = "Hello my name is" ;
}

class ChildClass : BaseClass

public override string str(){
   var string = "Sam";
}

The point is that if I want to access the str() method by creating an instance of the ChildClass, the string will print out as "Hello, my name is Sam".

I've been looking around and all I have been finding is that this should NOT happen, as the base class shouldn't even know that it is being inherited. So, if the design is false, how would I go about doing this? Keep in mind that there will be multiple child classes inheriting from BaseClass.

Thank you