display child item from database in C# using for loops

foreach (DataRow parentItem in ds.Tables["Categories"].Rows)
  {
    MenuItem categoryItem = new MenuItem((string)parentItem["CategoryName"]);
    menu.Items.Add(categoryItem);

    foreach (DataRow childItem in parentItem.GetChildRows("Children"))
    {
      MenuItem childrenItem = new MenuItem((string)childItem["ProductName"]);
      categoryItem.ChildItems.Add(childrenItem);
    }
  }