private void Read_btn_Click(object sender, RoutedEventArgs e)
        {
            String[] lines = File.ReadAllLines("C:\\Users\\Student\\Desktop\\big.txt");
            List<string> words = new List<string>();

            foreach (string l in lines)
            {
                string[] lineWords;
                lineWords = l.Split(new char[] { '.', '?', '!', ' ', ';', ':', ',', '*'}, StringSplitOptions.RemoveEmptyEntries);

                foreach (string word in lineWords)
                {
                    words.Add(word);
                }
            }

            ListView.ItemsSource = words;
        }