title: Mailto C# attachment syntax
body: <p>How can I attach a file to this mailto string?</p>
  
  <pre><code>string mailto = "mailto:" + to + "&amp;SUBJECT=" + subject + "?BODY=" + body + 
      "&amp;Attachment=" + attachment;
  </code></pre>
  
  <p>This doesn't work; the file isn't attached.</p>