set operation on a property return IList is not working
<p>I have an interface with:</p>

<pre><code>IList&lt;int&gt; CategoryIDs {get;set;}
</code></pre>

<p>Then a class that inherits this interface:</p>

<pre><code>public IList&lt;int&gt; CategoryIDs
{

     get {}  // this part works
     set { _categoryIDs = value;   // error!

}
</code></pre>

<p>The set part of the accessor reports an error:</p>

<blockquote>
  <p>cannot implicity convert type <code>IList&lt;int&gt;</code> to <code>List&lt;int&gt;</code>.</p>
</blockquote>

<p>What should I do? confused.</p>
