Hi Hitu,
In your BizTalk orchestration, just declare a message of type Xml.XmlDocument, which is the untyped message that does not relate to any schema. After you have GAC’ed your helper class, you can reference it in your orchestration by instantiating it, and passing that untyped message to a class method in an Expression shape.
Assuming that your third file is returned by your helper class, you can declare another message of type Xml.XmlDocument to hold its contents, and send it to a port mapped to the FTP adapter in your Orchestration.
Hope this helps,
Daniel.