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    <p><strong>System.GC.Collect</strong> is called when all objects which are there in memory are to be collected by the Garbage Collector. Objects which are referenced in managed code are not considered for Garbage collection. This method is used to force the system to reclaim the available memory.</p> <p><strong>Dispose()</strong> is not part of GC but as better practice you can use this. It should only be used for objects which uses unmanaged resources like FileStream etc. It should release all the resources that it owns. When you know that certain resources will not be released by GC then you can use the Dispose() method.</p> <p>The <a href="http://msdn.microsoft.com/en-us/library/yh598w02.aspx">using</a> statement ensures the correct use of IDisposable objects.</p> <p><strong>On a side note:</strong> The GC does not call Dispose, it calls the finalizer(which you should call from Dispose(false))</p> <p>Also, to make ensure that resources are always released appropriately, a Dispose method should be callable multiple times without throwing an exception.</p> <hr> <p>MSDN says:</p> <blockquote> <p><strong>"It is possible to force garbage collection by calling Collect, but most of the time, this should be avoided because it may create performance issues. "</strong></p> </blockquote> <p>Check this <a href="http://social.msdn.microsoft.com/Forums/vstudio/en-US/5afab48c-1ded-433b-a244-fd8d9e66de97/gccollect-dispose-and-destructor">blog</a>:-</p> <blockquote> <p>GC.Collect() asks the system to perform a collection "now". You shouldn't mess with this; the system usually has a much better idea than you do of when collection is necessary.</p> </blockquote> <p><strong>So is the best practice:</strong></p> <p>You can use the <strong>using</strong> block or as you mentioned use the <strong>Dispose</strong> method.</p> <p><strong>Why should you use IDisposable and Dispose?</strong></p> <p><a href="http://msdn.microsoft.com/en-us/library/ms973837.aspx">MSDN</a> says</p> <blockquote> <p>In many cases it is possible for objects that would otherwise always need to be finalized to avoid that cost by implementing the IDisposable interface. This interface provides an alternative method for reclaiming resources whose lifetime is well known to the programmer, and that actually happens quite a bit. Of course it's better still if your objects simply use only memory and therefore require no finalization or disposing at all; but if finalization is necessary and there are many cases where explicit management of your objects is easy and practical, then implementing the IDisposable interface is a great way to avoid, or at least reduce, finalization costs.</p> </blockquote> <p>Also check this article on <a href="http://www.codeproject.com/Articles/39246/NET-Best-Practice-No-2-Improve-garbage-collector">Improve garbage collector performance using finalize/dispose pattern</a> </p>
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    1. USRahul Tripathi
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    1. CO(Almost) Never ever use a destructor.
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    2. CO@HenkHolterman:- Deleted the Destructor part as I think that was misleading! Does that makes my answer better?
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    3. COYes, but it wasn't my -1.
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