title: File locked after sending it as attachment
body: <p>I am sending a file as an attachment:</p>
  
  <pre><code>            // Create  the file attachment for this e-mail message.
              Attachment data = new Attachment(filePath, MediaTypeNames.Application.Octet);
              // Add time stamp information for the file.
              ContentDisposition disposition = data.ContentDisposition;
              disposition.CreationDate = System.IO.File.GetCreationTime(filePath);
              disposition.ModificationDate = System.IO.File.GetLastWriteTime(filePath);
              disposition.ReadDate = System.IO.File.GetLastAccessTime(filePath);
              // Add the file attachment to this e-mail message.
              message.Attachments.Add(data);
  </code></pre>
  
  <p>And then I want to move the file to another folder, however when I try to do this</p>
  
  <pre><code>                    try
                      {
                          //File.Open(oldFullPath, FileMode.Open, FileAccess.ReadWrite,FileShare.ReadWrite);
                          File.Move(oldFullPath, newFullPath);
  
                      }
                      catch (Exception ex)
                      {
                      }
  </code></pre>
  
  <p>Its throwing an exception that the file is already being used in another process. How I can unlock this file so that it can be moved to this location?</p>