title: Remove multiple char types from end of string
body: <p>I have a loop that builds up address fields, some of these fields may be empty at the end of the string</p>
  
  <pre><code>List&lt;string&gt; list = new List&lt;string&gt;();
  
  //list can contain any number of values, some of which might be "" (empty string)
  
  string returnValue = "";
  for (int iRow = 1; iRow &lt;= list.Count; iRow++)
      returnValue += String.Format("{0}, ", list[iRow]);
  
  returnValue = returnValue.Trim();
  </code></pre>
  
  <p>my output is</p>
  
  <pre><code>asd, aaa, qwe, 123123, , , , , 
  </code></pre>
  
  <p>How can i remove the trailing ", " from the string?</p>