//Button click executes AddManager method.
 private void Btn_Confirm(object sender, RoutedEventArgs e)
 {
     //Validation for Manager properties.
     if (AddManagerValidation.Validate(amvm.Manager))
     {
         amvm.AddManager();
     }
 }
 private void Btn_Confirm(object sender, RoutedEventArgs e)
 {
     ovm.Manager.DateOfBirth = DateTime.Parse(date.ToString());
     if (AddManagerValidation.Validate(ovm.Manager))
     {
         ovm.AddManager();
         OwnerWindow window = new OwnerWindow();
         window.Show();
         Close();
     }
 }