修改xml文件时报错，等待解决

调用的方法如下
xml.UpdateElement(Server.MapPath("~/Roles.xml"), dd.Parent.Value.ToString().Substring(1), Eprelimits, "name", dd.Text)

public void UpdateElement(string path, string node_root, string new_text, string att_name, string att_value)
        {
            XmlReaderSettings settings = new XmlReaderSettings();
            settings.IgnoreComments = true;
            XmlReader reader = XmlReader.Create(path, settings);
            XmlDocument xmlDoc1 = new XmlDocument();
            xmlDoc1.Load(reader);
            LoadFunNode(xmlDoc1.DocumentElement,new_text,att_name,att_value,path,xmlDoc1);
        }

        private void LoadFunNode(XmlNode xmlnode, string new_text, string att_name, string att_value,string path,XmlDocument xmlDoc1)
        {
            foreach (XmlElement xe in xmlnode.ChildNodes)
            {
                if (xe.ChildNodes.Count > 0)
                {
                    LoadFunNode(xe, new_text, att_name, att_value,path,xmlDoc1);
                }
                if (xe.GetAttribute(att_name) == att_value)
                {
                    xe.SetAttribute("Value", new_text);    //内容赋值
                    break;
                }

            }
            xmlDoc1.Save(path);//保存
        }

每次运行到绿色那行代码的时候提示，文件正被另一个程序使用。该如何解决在线等 --------------------编程问答-------------------- public void UpdateElement(string path, string node_root, string new_text, string att_name, string att_value)
  {
  XmlReaderSettings settings = new XmlReaderSettings();
  settings.IgnoreComments = true;
  XmlReader reader = XmlReader.Create(path, settings);
  XmlDocument xmlDoc1 = new XmlDocument();
  xmlDoc1.Load(reader);
  LoadFunNode(xmlDoc1.DocumentElement,new_text,att_name,att_value,path,xmlDoc1);

xmlDoc1.Save(path);//保存放到这里看看呢，不知道是不是你用了递归的问题

  }
--------------------编程问答--------------------

--------------------编程问答--------------------

补充：.NET技术 ,  C#