title: Convert existing IEnumerable<int> to string (#,#,#,..) via Method
body: <p>I'm trying to convert an <code>IEnumerable&lt;int&gt;</code> to a string in the format <code>#,#,#,..</code>.  I'm having a terrible time attempting to make a method of this.  What is a quick and easy way to handle?</p>
  
  <p>Thanks.</p>