title: Added Elements to List<Tuple>
body: <p>I have a List defined as the following:</p>
  
  <pre><code>List&lt;Tuple&lt;string, long, DateTime&gt;&gt; firefoxBookmarkPaths = new List&lt;Tuple&lt;string, long, DateTime&gt;&gt;();
  </code></pre>
  
  <p>However I'm having trouble adding to my list:</p>
  
  <pre><code>List&lt;Tuple&lt;string, long, DateTime&gt;&gt; firefoxBookmarkPaths = new List&lt;Tuple&lt;string, long, DateTime&gt;&gt;();
  
  long fileSize = 0;
  string bookmarkFile = null;
  string directoryToCheck = null;
  DateTime fileModifiedDate = DateTime.MinValue;
  
  foreach (var dir in basePersistDirectories)
  {
      directoryToCheck = dir + @"\C\Users" + @"\" + Environment.UserName + @"\" + @"AppData\Roaming\Mozilla\Firefox\Profiles";
      if (Directory.Exists(directoryToCheck))
      {
          var subDirectories = Directory.GetDirectories(directoryToCheck);
          foreach (var directory in subDirectories)
          {
              bookmarkFile = directory + @"\places.sqlite";
  
              if (File.Exists(bookmarkFile))
              {
                  fileSize = new FileInfo(bookmarkFile).Length;
                  fileModifiedDate = new FileInfo(bookmarkFile).LastWriteTimeUtc;
              }
          }
  
          firefoxBookmarkPaths.Add(bookmarkFile, fileSize, fileModifiedDate);
      }
  }
  </code></pre>
  
  <p>The line <code>firefoxBookmarkPaths.Add(bookmarkFile, fileSize, fileModifiedDate);</code> is throwing error "No overload for method 'Add' takes 3 arguments." How can I add elements to this list?</p>