C# - GetUserByID (LiveLink API 9.1.0.3)

PPG_DevTeam_(pfizerukppgdevteam_-_(deleted))

Hi ! I ought to call GetUserByID function from LiveLink API 9.1.0.3. How can I do it on C# ? I could not find any classes, which contain this function ! There is it ? Thank you.P.S. Sorry for my bad English :-)