>>>>>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#_
>>
>>Question:
>>I looked at the first book and ordered it then looked at the second one. I see this covers C#4 - but it's not clear whether it's a rehash of the first or whether it covers entirely different topics. Is it worth getting both ?
>>TIA
>
>It's not a rehash. The first one covered new features in C# 2.0 and 3.0. The second covers new features in 4.0.

Thanks Mike. Though I guess I'll wait to see how I like the first one before ordering the second......