When would you use Abstract methods over virtual methods in C#?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/391483/what-is-the-difference-between-abstract-function-and-virtual-function">What is the difference between an abstract and virtual function?</a>  </p>
</blockquote>

<p>What are the advantages of using <code>abstract</code> over <code>virtual</code> methods and vice versa?</p>

<p><strong>Abstract Methods:</strong>   </p>

<ul>
<li>Only the abstract class can hold abstract methods.</li>
<li>Also the derived class need to implement the method and no implmentation is provided in the class.</li>
</ul>

<p><strong>Virtual Methods:</strong></p>

<ul>
<li>A class can declare these and also provide the implementaion of the same.</li>
<li>Also the derived class need to implement of the method to override it.</li>
</ul>
