/// <summary>
        /// 获取指定节点的值
        /// </summary>
        /// <param name="strFileName">文件路径</param>
        /// <param name="nodeName">节点名称</param>
        /// <param name="value">设置后的值</param>
        /// <param name="nodeDir">指定节点所在的节点目录</param>
        /// <returns></returns>
        public static string GetNodeValue(string strFileName, string nodeName, string nodeDir)
        {
            string value = null;
            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(strFileName);

                XmlNodeList nodeList = xmlDoc.SelectSingleNode(nodeDir).ChildNodes;//获取bookstore节点的所有子节点 

                foreach (XmlNode xn in nodeList)    //遍历所有子节点 
                {
                    XmlElement xe = (XmlElement)xn;  //将子节点类型转换为XmlElement类型 

                    if (xe.Name == nodeName)
                    {
                        value = xe.InnerText.Trim();

                        break;
                    }
                }
            }
            catch (Exception exp)
            {
                throw exp;
            }

            return value;
        }

        /// <summary>
        /// 获取指定节点下面对应属性的值
        /// </summary>
        /// <param name="strFileName">文件路径</param>
        /// <param name="nodeName">节点名称</param>
        /// <param name="nodeDir">指定节点所在的节点目录</param>
        /// <param name="attribute">节点对应的属性名称</param>
        /// <returns></returns>
        public static string GetNodeValue(string strFileName, string nodeName, string nodeDir, string attribute)
        {
            string value = null;
            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(strFileName);

                XmlNodeList nodeList = xmlDoc.SelectSingleNode(nodeDir).ChildNodes;//获取bookstore节点的所有子节点 

                foreach (XmlNode xn in nodeList)    //遍历所有子节点 
                {
                    XmlElement xe = (XmlElement)xn;  //将子节点类型转换为XmlElement类型 

                    if (xe.Name == nodeName)
                    {
                        //value = xe.InnerText.Trim();
                        value = (xe).Attributes[attribute].Value;
                        break;
                    }
                }
            }
            catch (Exception exp)
            {
                throw exp;
            }

            return value;
        }

------解决方案--------------------
C# code

 protected void Page_Load(object sender, EventArgs e)
        {
            string serverpath