How to add and bind column in datagrid in WPF?

private void AddColumn_Click(object sender, RoutedEventArgs e)
    {
      dt.Columns.Add(new DataColumn("New Column" + newColumnIndex++));
      for (int i = 0; i < dt.Rows.Count; i++)
      {
        dt.Rows[i][dt.Columns.Count - 1] = i.ToString() + " - New Column";
      }

      // Refresh the DataGrid
      dataGrid.ItemsSource = null;
      dataGrid.ItemsSource = dt.DefaultView;
    }