}//end button_click event

        private void BtnClearAll(object sender, RoutedEventArgs e)
        {
            LstRanked.Items.Clear();
            TxtToRank.Clear();
            LstUnique.Items.Clear();
            TxtToRank.Focus();
        }//end Button_ClearAll event
        }     //end main event

        private void BtnCompute_Click(object sender, RoutedEventArgs e)
        {
            ranking.NumRanked   = 0;
            ranking.PercentRank = 0;
            LstUnique.Items.Clear();
            ranking.ConvertArray(TxtToRank.Text);
            CheckRank();
            TxtToRank.Focus();
        }//end button_click event
 public MainWindow()
 {
     InitializeComponent();
     if (File.Exists(path))
     {
         ranking.ImportFile(path);
         BtnCompute.IsEnabled   = true;
         LblErrorBar.Background = Brushes.Transparent;
         LblErrorBar.Content    = "";
     }
     else
     {
         LblErrorBar.Background = Brushes.Red;
         LblErrorBar.Foreground = Brushes.White;
         LblErrorBar.Content    = "Error: Check file not found. Open file location and attach file.";
         BtnCompute.IsEnabled   = false;
     } //end if
     TxtToRank.Focus();
 }     //end main event