public void RemoveDr()
        {
            String       text   = "Do You Want To Remove " + ListSelectedDoctor.Value + " ?";
            DialogResult answer = System.Windows.Forms.MessageBox.Show(text, "", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

            if (answer == DialogResult.Yes)
            {
                DoctorsComboBox.Add(new ComboBoxPairs(ListSelectedDoctor.Key, ListSelectedDoctor.Value));
                Hospital.Patients[PatientID].removeDoctor(ListSelectedDoctor.Key);
                ((Doctor)Hospital.Employees[ListSelectedDoctor.Key]).Patients.Remove(PatientID);
                HospitalDB.DeleteDoctorPatient(ListSelectedDoctor.Key, PatientID);
                DoctorsList.Remove(ListSelectedDoctor);
                DoctorsNumber = "Doctors: " + Hospital.Patients[PatientID].Doctors.Count().ToString();
            }
        }
        public void AssignDoctor()
        {
            DoctorsList.Add(new ComboBoxPairs(DoctorComboBox.Key, DoctorComboBox.Value));
            foreach (Doctor doctor in Hospital.Employees.Values)
            {
                if (doctor.ID == DoctorComboBox.Key)
                {
                    Hospital.Patients[PatientID].Doctors.Add(doctor.ID, doctor);
                    HospitalDB.InsertDoctorPatient(doctor.ID, PatientID);
                    DoctorsNumber = "Doctors: " + Hospital.Patients[PatientID].Doctors.Count().ToString();
                    break;
                }
            }
            ((Doctor)Hospital.Employees[DoctorComboBox.Key]).Patients.Add(PatientID, Hospital.Patients[PatientID]);
            DoctorsComboBox.Remove(DoctorComboBox);

            Home.ViewModel.CloseRootDialog();
        }