static void AddTeacherToClass() { ServiceFactory factory = new ServiceFactory(); IClassService cService = factory.CreateClassService(); string classGuid = "d3a65d5b-2045-47db-a326-ab787a2fe371"; List <string> teacherList = new List <string>() { "user_10", "user_11" }; bool success = cService.AddTeachers(classGuid, teacherList); if (!success) { printError(cService.LastError); } else { Console.WriteLine(string.Format("Teachers are added specified class {0}.", classGuid)); } }