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I am building an application where i am obligated to create a MailMessage (System.Net.mail.MailMessage) and save it on the disk as .msg extention not .eml Below is the method i'm using to save a MailMessage as .msg file: public static void Save(MailMessage Message, string FileName) { Assembly assembly = typeof(SmtpClient).Assembly; Type _mailWriterType = assembly.GetType("System.Net.Mail.MailWriter"); using (FileStream _fileStream = new FileStream(FileName, FileMode.Create)) { // Get reflection info for MailWriter contructor ConstructorInfo _mailWriterContructor = _mailWriterType.GetConstructor( BindingFlags.Instance | BindingFlags.NonPublic, null, new Type[] { typeof(Stream) }, null); // Construct MailWriter object with our FileStream object _mailWriter = _mailWriterContructor.Invoke(new object[] { _fileStream }); // Get reflection info for Send() method on MailMessage MethodInfo _sendMethod = typeof(MailMessage).GetMethod( "Send", BindingFlags.Instance | BindingFlags.NonPublic); // Call method passing in MailWriter _sendMethod.Invoke( Message, BindingFlags.Instance | BindingFlags.NonPublic, null, new object[] { _mailWriter, true }, null); // Finally get reflection info for Close() method on our MailWriter MethodInfo _closeMethod = _mailWriter.GetType().GetMethod( "Close", BindingFlags.Instance | BindingFlags.NonPublic); // Call close method _closeMethod.Invoke( _mailWriter, BindingFlags.Instance | Bi

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