>>Now, let me give you a little brain teaser
>>
>>What is an elegant way to dispose an object IF it implements IDisposable.
>> You do not know whether the object implements IDisposable
>>
>>

>>public void SomeMethod(ISomeInterface theObject)
>>{
>>	// do something with theObject
>>	// and if theObject implements IDisposable
>>	// dispose it
>>}

Can't think of anything beyond the obvious:

if (theObject is IDisposable) ((IDisposable)theObject).Dispose();
>//or
>IDisposable d = theObject as IDisposable;
>if (d != null) d.Dispose();

But presumably you've seen something else ? :-}

Seen something else ? Yes

It's the latter of the obvious, but the compiler does it for you

public void SomeMethod(ISomeInterface theObject)
{
	using (theObject as IDisposable)
	{
		// do something here


	} //dispose 
}

pages 32-33 http://www.amazon.co.uk/More-Effective-Specific-Software-Development/dp/0321485890/ref=sr_1_1?ie=UTF8&s=books&qid=1295806114&sr=8-1

Also good to read http://www.amazon.co.uk/Effective-covers-4-0-Specific-Development/dp/0321658701/ref=sr_1_3?ie=UTF8&s=books&qid=1295806114&sr=8-3#_