In your sample Aspose.Word.Demos you implemented the Viewer. The print function does not work and triggers an error.
I asked this question on a previouse Forum entry: When Do you believe to have that problem fixed and when Do you plan to take the Viewer into Release-Mode?
Sorry, we don't provide fixes for Aspose.Words.Viewer beta.
I cannot provide any deadline for Aspose.Words.Viewer release yet - but it is our top priority task and we are putting our best efforts to complete it as soon as possible.
We are happy to tell you that the new Rendering Engine has replaced the “old Viewer Beta”. The Rendering Engine can print, save as images or draw onto .NET Graphics object any document page.
Please see Aspose.Words documentation to learn more about new features.