Question

    void Swap(Empolyee lhs, Empolyee rhs) {
        Empolyee tmp = lhs;
        lhs = rhs;
        rhs = tmp;
    }

I want to swap two Employees using this method, but it doesn’t work. Although it works after imposing ref keyword on the parameter, I want to know the reason why the former doesn’t work. Because every object in C# is reference-type, I thought it should work. I am looking forward to your help, thanks.

Answer 1

 void Swap(ref Empolyee lhs, ref Empolyee rhs) {
    Empolyee tmp = lhs;
    lhs = rhs;
    rhs = tmp;
 }

Then call:

  Swap(ref lhs, ref  rhs);