熟悉在NET下操作XML的朋友请进
我将下面代码放到我的CS类,我加了命名空间:using System.Xml;但CreateNode、root都显示有波浪线提示有问题，不知为什么啊，那位高手帮我看看。谢谢

public void AddTableHaderFirstRowSingleCell(string colname, string paramvalue)
  {
  XmlNode node = null;
  XmlNodeList refCd = root.SelectNodes("//default:Report//default:Body//default:ReportItems//default:Table//default:Header//default:TableRows//default:TableRow//default:TableCells", xnm);
  XmlElement docFrag = doc.CreateElement("TableCell", "http://schemas.microsoft.com/sqlserver/reporting/2005/01/reportdefinition");
  node = CreateNode("ReportItems");
  XmlElement textbox = doc.CreateElement("Textbox", "http://schemas.microsoft.com/sqlserver/reporting/2005/01/reportdefinition");
  textbox.SetAttribute("Name", colname);
  node.AppendChild(textbox);
  XmlNode zindex = CreateNode("ZIndex", "12");
  textbox.AppendChild(zindex);
  XmlNode style = CreateNode("Style");
  XmlNode borderstyle = CreateNode("BorderStyle");
  style.AppendChild(borderstyle);
  XmlNode defaul = CreateNode("Default", "Solid");
  borderstyle.AppendChild(defaul);
  XmlNode textalign = CreateNode("TextAlign", "Center");
  style.AppendChild(textalign);
  XmlNode PaddingLeft = CreateNode("PaddingLeft", "2pt");
  style.AppendChild(PaddingLeft);
  XmlNode PaddingBottom = CreateNode("PaddingBottom", "2pt");
  style.AppendChild(PaddingBottom);
  XmlNode FontFamily = CreateNode("FontFamily", "宋体");
  style.AppendChild(FontFamily);
  XmlNode FontWeight = CreateNode("FontWeight", "700");
  style.AppendChild(FontWeight);
  XmlNode VerticalAlign = CreateNode("VerticalAlign", "Bottom");
  style.AppendChild(VerticalAlign);
  XmlNode PaddingTop = CreateNode("PaddingTop", "2pt");
  style.AppendChild(PaddingTop);
  XmlNode PaddingRight = CreateNode("PaddingRight", "2pt");
  style.AppendChild(PaddingRight);
  textbox.AppendChild(style);
  XmlNode cangrow = CreateNode("CanGrow", "true");
  textbox.AppendChild(cangrow);
  XmlNode value = CreateNode("Value", paramvalue);
  textbox.AppendChild(value);
  docFrag.AppendChild(node);
  refCd[0].InsertAfter(docFrag, refCd[0].LastChild);
  doc.Save(filename);
  }

------解决方案--------------------
你的root对象是从哪里来的都不知道,CreateNode方法也一样没有``
是从哪里复制的代码吧``?