title: Second path fragment must not be a drive or UNC name - Create Subdirectory Error
body: <p>I have an exception in the third line ofthis code "Second path fragment must not be a drive or UNC name"</p>
  
  <pre><code>DirectoryInfo labdi = new DirectoryInfo(Back.mainfolderpath + @"\news\l");
  DirectoryInfo tld = new DirectoryInfo(labdi.FullName + @"\" + NorA.sn.labl[i]);
  tld = labdi.CreateSubdirectory(labdi.FullName + @"\" + NorA.sn.labl[i] + @"\");
  </code></pre>
  
  <p>There is no useful way on the web.
  Thank You.:!</p>