C# - Why can't I pass a class declared in a using statement as a reference type?

Question

Suppose I have the following disposable class and example code to run it:

public class DisposableInt : IDisposable
{
    private int? _Value;

    public int? My         


        

Answer 1

Why is this?

Variables declared in using statements are read-only; out and ref parameters aren't. So you can do this:

DisposableInt theInt = new DisposableInt(1);
using (theInt)
{
    AddOne(ref theInt);
}

... but fundamentally you're not using the fact that it's a ref parameter anyway...

It's possible that you've misunderstood what ref really means. It would be a good idea to read my article on parameter passing to make sure you really understand.