// ******************************  PATIENT ********************************************
 public void AddPatient(t_user Patient)
 {
     Patient.DTYPE = "Patient";
     Patient.role = 2;
     utwk.UserRepository.Add(Patient);
     utwk.Commit();
 }
 // ******************************  ADMIN ********************************************
 public void AddAdmin(t_user Admin)
 {
     Admin.DTYPE = "Administrator";
     Admin.role = 0;
     utwk.UserRepository.Add(Admin);
     utwk.Commit();
 }
 // ******************************  DOCTOR ********************************************
 public void AddDoctor(t_user Doctor)
 {
     Doctor.DTYPE = "Doctor";
     Doctor.role = 1;
     Doctor.login = Doctor.firstName + "." + Doctor.lastName;
     Doctor.password = "******" + Doctor.firstName;
     utwk.UserRepository.Add(Doctor);
     utwk.Commit();
 }
 public void UpdateUser(t_user User)
 {
     utwk.UserRepository.Update(User);
     utwk.Commit();
 }