private void deleteButton_Click(object sender, RoutedEventArgs e)
        {
            MessageBoxResult result = MessageBox.Show("Are you sure you want to delete this file?",
                                                      "Confirmation",
                                                      MessageBoxButton.YesNo,
                                                      MessageBoxImage.Question);

            if (result == MessageBoxResult.Yes)
            {
                File.Delete(@str);
                Text_File_Contents.Clear();
                MessageBox.Show("File deleted");
            }
        }
        private void button_Click(object sender, RoutedEventArgs e)
        {
            Text_File_Contents.Clear();


            OpenFileDialog ofd = new OpenFileDialog();

            ofd.DefaultExt = ".txt";



            if (ofd.ShowDialog() == true)
            {
                str = ofd.FileName;

                Text_File_Contents.Text = File.ReadAllText(str);
            }

            MessageBox.Show("Here is the file's contents");
        }