private void matchBut_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         if (!current_tournament.StartNewMatch())
         {
             MessageBox.Show("This Match is ended", "Information", MessageBoxButton.OK, MessageBoxImage.Information);
         }
         TournamentListB.SelectedIndex = TournamentListB.Items.Count - 1;
         TournamentListB.ScrollIntoView(TournamentListB.SelectedItem);
     }
     catch (Exception)
     {
         MessageBox.Show("This Match is ended", "Information", MessageBoxButton.OK, MessageBoxImage.Information);
     }
 }