public void SaveExecute()
 {
     if (String.IsNullOrEmpty(ClinicManager.NameAndSurname) || String.IsNullOrEmpty(ClinicManager.IdentityCardNumber) || String.IsNullOrEmpty(ClinicManager.DateOfBirth.ToString()) || String.IsNullOrEmpty(ClinicManager.Gender) ||
         String.IsNullOrEmpty(ClinicManager.Citizenship) || String.IsNullOrEmpty(ClinicManager.Username) || String.IsNullOrEmpty(ClinicManager.Password) || String.IsNullOrEmpty(ClinicManager.NumberOfOmissions.ToString()) ||
         String.IsNullOrEmpty(ClinicManager.MaximumNumberOfSupervisedDoctors.ToString()) || String.IsNullOrEmpty(ClinicManager.MinimumNumberOfSupervisedRooms.ToString()) ||
         String.IsNullOrEmpty(ClinicManager.Floor.ToString()))
     {
         MessageBox.Show("Please fill all fields.", "Notification");
     }
     else
     {
         try
         {
             MessageBoxResult result = MessageBox.Show("Are you sure you want to edit the manager?", "Confirmation", MessageBoxButton.YesNo, MessageBoxImage.Question);
             if (result == MessageBoxResult.Yes)
             {
                 bool isEdited = managers.EditManager(ClinicManager);
                 if (isEdited)
                 {
                     MessageBox.Show("Manager is edited.", "Notification", MessageBoxButton.OK);
                     managerView.Close();
                 }
                 else
                 {
                     MessageBox.Show("Manager cannot be edited.", "Notification", MessageBoxButton.OK);
                 }
             }
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.ToString());
         }
     }
 }