private void LogOutExecute()
 {
     try
     {
         emp.Close();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }
 private void LogOutExecute()
 {
     try
     {
         AuthenticationWindow aw = new AuthenticationWindow();
         emp.Close();
         aw.Show();
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.ToString());
     }
 }