OfficeOpenXml.Table.PivotTable.ExcelPivotTableField.AddFieldItems C# (CSharp) Method

        private void AddFieldItems(int items)
        {
            XmlElement prevNode = null;
            XmlElement itemsNode = TopNode.SelectSingleNode("d:items", NameSpaceManager) as XmlElement;
            for (int x = 0; x < items; x++)
            {
                var itemNode = itemsNode.OwnerDocument.CreateElement("item", ExcelPackage.schemaMain);
                itemNode.SetAttribute("x", x.ToString());
                if (prevNode == null)
                {
                    itemsNode.PrependChild(itemNode);
                }
                else
                {
                    itemsNode.InsertAfter(itemNode, prevNode);
                }
                prevNode = itemNode;
            }
            itemsNode.SetAttribute("count", (items + 1).ToString());
        }