The Xceed Signing control provides the following methods to accomplish tasks related to digitally signing data (or files) and verifying if data corresponds to a particular digital signature.
The only property in the Xceed Signing control is named SigningMethod and you need to verify that it is set to the desired digital signing algorithm before calling any of the control's methods that actually sign or verify data.
All Xceed Signing control methods return an HRESULT return code. See the Error codes topic for details on error handling.