public static OrderFieldCollection getOrderFields()

class MyPage : System.Web.UI.Page
{
 
    private string GetOrderFieldsLayer()
    {
        System.Text.StringBuilder sbReturn = new System.Text.StringBuilder();
        OrderFieldCollection fields  = OrderField.GetOrderFields();

        sbReturn.Append("<div id=""OrderFieldLayer"" style=""position:absolute; display:none"">");
        if( fields.Count > 0 ) {
           sbReturn.Append("<table style=""border:solid 1px #7F9DB9; background-color:#ffffff"" cellpadding=""0"" cellspacing=""0"">");
           sbReturn.Append("<tr><td>"); 
           sbReturn.Append("<div>");
        }
        foreach( OrderField field in fields )
        {
           sbReturn.AppendFormat("<table style=""cursor:hand"" cellpadding=""0"" cellspacing=""0"" onClick=""addOrderField('{0}','{1}');"" onmouseover=""mouseoverBox(this);"" onmouseout=""mouseoutBox(this);""><tr>" + 
                                 "  <td style=""height:20px; width:20px; background-color:#D4D0C8"" align=""center""><img src=""../images/arrow.gif"" border=0></td>" + 
                                 "  <td style=""PADDING-LEFT: 5px; "">&nbsp;{2}</td>" + 
                                 "  <td style=""WIDTH:9px;""></td>" + 
                                 "</tr></table>",  
                                 Base.HtmlEncode(Base.JSEncode(field.SystemName)), 
                                 Base.HtmlEncode(Base.JSEncode(field.Name)), 
                                 Base.HtmlEncode(field.Name) 
                                 );
        }
        sbReturn.Append("</div>");
        sbReturn.Append("</td></tr>");
        sbReturn.Append("</table>");
 
        return sbReturn.ToString();
    }
}

class MyPage : System.Web.UI.Page
{
   public void DoDeleteAll()
   {
       foreach (OrderField orderField in OrderField.getOrderFields())
       {
           orderField.Delete();
       }
   }
}