.net 操作web.config文件

                    XmlDocument doc = new XmlDocument();
                    string wc = HttpContext.Request.PhysicalApplicationPath + @"/web.config";

                    //设置修改节点路径                          
                    string changeNode = "/configuration/XryangConfig/CachingEnabled";

                    //加载web.config文件  
                    doc.Load(wc);


                    //找到要修改的节点  
                    XmlNode node = doc.SelectSingleNode(changeNode);

                    //设置节点的值  
                    node.Attributes["Enabled"].InnerText = isOpen.ToString();

                    //保存设置
                    doc.Save(wc);

                    response.StatusCode = 200;