Does passing Reference Types using ref save memory?

Question

In C#, the parameters to a method can be either reference types or value types. When passing reference types, a copy of the reference is passed. This way, if inside a method

Answer 1

Yes, there is a reason: If you want to reassign the value. There is no difference in value types and reference types in that regards.

See the following example:

class A
{
    public int B {get;set;}
}

void ReassignA(A a)
{
  Console.WriteLine(a.B);
  a = new A {B = 2};
  Console.WriteLine(a.B);
}

// ...
A a = new A { B = 1 };
ReassignA(a);
Console.WriteLine(a.B);

This will output:

1
2
1

Performance however has nothing to do with it. This would be real micro optimization.