Is it possible to upload a file, and post meta data (in the post body) at the same time in OpenRasta? and if so, do you have an example of how to do this?
I'm not sure I understand the question? When you upload a file from an html form, you get the whole form formatted as multipart/form-data, which means each field gets its own value sent alongside the files.
You only need to define your handler method as Post(string formValue, IFile file) and it'll work as is.