title: Convert datarow(only single column) to a string list
body: <p>Please look at what is wrong? I want to convert datarow to a string list.</p>
  
  <pre><code> public List&lt;string&gt; GetEmailList()
      {
          // get DataTable dt from somewhere.
          List&lt;DataRow&gt; drlist = dt.AsEnumerable().ToList();
          List&lt;string&gt; sEmail = new List&lt;string&gt;();
          foreach (object str in drlist)
          {
              sEmail.Add(str.ToString()); // exception
          }
          return sEmail; // Ultimately to get a string list.
      }
  </code></pre>
  
  <p>Thanks for help.</p>