Methods overloading with value and reference parameter types

Question

I have the following code :

class Calculator
    {
        public int Sum(int x, int y)
        {
            return x + y;
        }



        public int Sum(o         


        

Answer 1

out parameter modifier (C# Reference)

Although the ref and out keywords cause different run-time behavior, they are not considered part of the method signature at compile time. Therefore, methods cannot be overloaded if the only difference is that one method takes a ref argument and the other takes an out argument.

Also see: ref (C# Reference)

Members of a class can't have signatures that differ only by ref and out. A compiler error occurs if the only difference between two members of a type is that one of them has a ref parameter and the other has an out parameter.