c# - File locked after sending it as attachment

Question

I am sending a file as an attachment:

            // 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);

And then I want to move the file to another folder, however when I try to do this

                    try
                    {
                        //File.Open(oldFullPath, FileMode.Open, FileAccess.ReadWrite,FileShare.ReadWrite);
                        File.Move(oldFullPath, newFullPath);

                    }
                    catch (Exception ex)
                    {
                    }

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?

Answer 1

Disposing your message will fix this for you. Try calling Dispose on your message before moving the file, like so:

message.Dispose();
File.Move(...)

When disposing MailMessage, all locks and resources are released.