Is IDisposable.Dispose() called automatically? [duplicate]

Answer 1

If you instantiate your object in a using statement, Dispose() is called for you when code exits the using block

using(var myObject = new MyDisposableObject())
{
  blah();
} // Dispose() is called here (or whenever the code exits the block)

If you don't use using, then it's up to you (the calling code) to dispose of your object by explicitely calling Dispose().

Also, you (the implementor of MyObject) can add support for a finalizer in case your caller doesn't call Dispose(). More info here.