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();
            }
        }