private void detach_UserCourses(UserCourse entity)
 {
     this.SendPropertyChanging();
     entity.User = null;
 }
 private void attach_UserCourses(UserCourse entity)
 {
     this.SendPropertyChanging();
     entity.User = this;
 }
 partial void UpdateUserCourse(UserCourse instance);
 partial void DeleteUserCourse(UserCourse instance);
 partial void InsertUserCourse(UserCourse instance);