Aspose.Words for .NET. Convert file to MHTML using C#.

docx-to-mhtml.cs

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Document.docx");

Stream stream = new MemoryStream();
doc.Save(stream, SaveFormat.Mhtml);

// Rewind the stream to the beginning so Aspose.Email can read it.
stream.Position = 0;

// Create an Aspose.Email MIME email message from the stream.
MailMessage message = MailMessage.Load(stream, new MhtmlLoadOptions());
message.From = "your_from@email.com";
message.To = "your_to@email.com";
message.Subject = "Aspose.Words + Aspose.Email MHTML Test Message";

// Send the message using Aspose.Email.
SmtpClient client = new SmtpClient();
client.Host = "your_smtp.com";
client.Send(message);