private void SignupManagerExecute()
 {
     try
     {
         MessageBoxResult result = MessageBox.Show("Are you sure that you want to signup as Manager?",
                                                   "My App", MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
         switch (result)
         {
         case MessageBoxResult.Yes:
             PasswordFromFile addManager = new PasswordFromFile();
             signup.Close();
             addManager.ShowDialog();
             break;
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }
 public PasswordFromFileViewModel(PasswordFromFile passwordFromFileOpen)
 {
     passwordFromFile = passwordFromFileOpen;
 }