new from c# 7-10 

public class AddClass(int x,int y)

{

    public int Sum()

    {

        return x + y;

    }

}

AddClass addClass = new AddClass(5,4);

int result = addClass.Sum();

//-----------------------------------------------------------------------

The in keyword in C# is used in several contexts:

1. Method Parameters (in modifier) – It allows passing arguments by reference but ensures they cannot be modified inside the method.

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Global Using