>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 ? :-}