I need to provide an XPS document in C #, but I will not find any library, please help me ...
Thank.
I'm not quite sure what you mean by “safe XPS document”.
If you want to add a signature so that the reader can verify that the document was generated by you, I would suggest looking at System.Windows.Xps.Packaging .
If you mean encrypting a document to restrict who can view its contents, I would suggest looking at System.IO.Packaging.EncryptedPackageEnvelope