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    <p><strong>Links at Stackoverflow</strong></p> <ul> <li><a href="https://stackoverflow.com/questions/239127/exact-use-of-abstract-class"><strong>Exact use of Abstract class</strong></a></li> <li><a href="https://stackoverflow.com/questions/1165332/interface-or-abstract-class"><strong>Interface or abstract class?</strong></a></li> <li><a href="https://stackoverflow.com/questions/1474249/abstract-classes-vs-interfaces"><strong>Abstract classes vs Interfaces</strong></a> </li> <li><a href="https://stackoverflow.com/questions/1028285/why-do-both-the-abstract-class-and-interface-exist-in-net"><strong>Why do both the abstract class and interface exist in .Net?</strong></a></li> <li><a href="https://stackoverflow.com/questions/1165935/differences-between-an-abstract-class-and-an-interface-in-c"><strong>differences between an abstract class and an interface in C#</strong></a></li> <li><a href="https://stackoverflow.com/questions/681602/whats-the-difference-between-an-interface-and-an-abstract-class"><strong>What’s the difference between an interface and an abstract class?</strong></a> </li> <li><a href="https://stackoverflow.com/questions/479142/when-to-use-an-interface-instead-of-an-abstract-class-and-vice-versa"><strong>When to use an interface instead of an abstract class and vice versa?</strong></a></li> <li><a href="https://stackoverflow.com/questions/627199/can-you-help-me-understand-in-a-practical-example-the-usage-abstract-classes-vs-i"><strong>Help me understand in a practical example the usage abstract classes vs interfaces?</strong></a></li> </ul> <p><strong>Others</strong></p> <ul> <li><a href="http://www.codeproject.com/KB/cs/abstractsvsinterfaces.aspx" rel="nofollow noreferrer"><strong>Abstract Class versus Interface</strong></a></li> <li><a href="https://stackoverflow.com/posts/2308801/edit"><strong>Should I use an abstract class or an interface?</strong></a></li> <li><a href="http://blogs.msdn.com/abhinaba/archive/2006/02/13/530824.aspx" rel="nofollow noreferrer"><strong>Abstract base class over interface</strong></a></li> <li><a href="http://codeofdoom.com/wordpress/2009/02/12/learn-this-when-to-use-an-abstract-class-and-an-interface/" rel="nofollow noreferrer"><strong>Learn This: When to use an Abstract Class and an Interface</strong></a></li> <li><a href="http://msdn.microsoft.com/en-us/library/scsyfw1d(VS.71).aspx" rel="nofollow noreferrer"><strong>Recommendations for Abstract Classes vs. Interfaces - MSDN</strong></a></li> <li><a href="http://aspalliance.com/1213_Working_with_Abstract_classes_Sealed_Classes_and_Interfaces_in_C.4" rel="nofollow noreferrer"><strong>Working with Abstract classes, Sealed Classes, and Interfaces in C#</strong></a></li> <li><a href="http://sadi02.wordpress.com/2008/05/08/what-is-difference-in-an-abstract-class-and-an-interface/" rel="nofollow noreferrer"><strong>Difference between Abstract class and Interface in C# (.Net)</strong></a></li> </ul>
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    1. POAbstract classes and interfaces in C#
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    1. COIdentification of duplicates belongs in the comments to the questions, along with a close vote as you have the rep for it.
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    2. COIt got closed probably after several hours. The links were not identified before my post!
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    3. CO@Asad: that is the point. *You* identified a duplicate, so *you* should have posted a *comment* (rather than an answer) *and* voted to close. With the power comes the responsibility.
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