What is the relationship between the using keyword and the IDisposable interface?

Question

If I am using the using keyword, do I still have to implement IDisposable?

Answer 1

You must implement IDisposable to use using. If you try to use using() on a type that does not implement IDisposable you get the following compile time error:

error CS1674: 'SomeType': type used in a using statement must be implicitly convertible to 'System.IDisposable'