How get range of numbers
<p>I have a interval of number [1, 20]. </p>

<p>I want a method which returns me range of number available if I decide to ban range [15, 18]. My method should return me a list containing [1,15] and [18, 20]</p>

<p>Range object could looks like something like that</p>

<pre><code>public class Range
{
     int Start {get;set;}
     int End {get;set;}
}
</code></pre>

<p>Any help would be appreciated.</p>
