You will need a C#/VB class that has a static method that is passed a file name and returns an XLANG MessagePart
In the orchestration:
MultipartMessage.Attachment = MyNamespace.MyClass.GetFileAsMessagePart(\”C:\\temp\\image.jpg\”);
Probably best to make the filename a configurable parameter
Is the image file is referenced in an img element of the Html?
This could prove somewhat trickier
An alternative would be to publish the image file on a public internet site and add a Url reference in your Html
e.g.
<img src=\”http://www.public.com/images/image.jpg\”/>