public string GetCartFormName()

class MyPage : System.Web.UI.Page
{
   public void RenderOrder(Order order, Template template, Dynamicweb.Frontend.PageView pageView)
   {
       // New form to replace the quantity form to also include orderline fields
       if (order.StepNum < 2)
       {
          if (pageView != null)
          {
             int pageID = pageView.Page.ID;
             template.SetTag("Ecom:Order:CartForm.Start", string.Format("<form action=\"/Default.aspx\" name=\"{0}\" method=\"POST\">", order.GetCartFormName()));
             template.SetTag("Ecom:Order:CartForm.End", "</form>");
             template.SetTag("Ecom:Order:CartForm.Name", order.GetCartFormName());
             template.SetTag("Ecom:Order:CartForm.SubmitUpdate", string.Format("javascript:document.{0}.action = '/Default.aspx?ID={1}&step=1'; document.{0}.submit();", order.GetCartFormName(), pageView.Page.ID));
             template.SetTag("Ecom:Order:CartForm.SubmitOrder", string.Format("javascript:document.{0}.action = '/Default.aspx?ID={1}&step=2'; document.{0}.submit();", order.GetCartFormName(), pageView.Page.ID));
          }
      }
   }
}