c# BitmapImage to PDF class

c# class one method that simply converts BitmapImage to a pdf document. The method must save the file to disk in pdf format. You cannot use any third party dlls; the project deliverables must be nothing but pure c# code. There is already an open source c# pdf library at: [login to view URL] The source code is readily available. Not all of the code is required. I just want the minimal amount of code used in this class. I only need the code that is necessary to convert BitmapImage to pdf and save it to disk with a path. Note: the function must be able to convert any size image to pdf