在.NET(C#)Web服务中原生地返回XML？

using System;
using System.IO;
using System.Xml;

public partial class XmlReturn : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // 创建一个XmlDocument对象并填充XML数据
        XmlDocument xmlDoc = new XmlDocument();
        XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", null);
        XmlElement rootElement = xmlDoc.CreateElement("Root");
        XmlElement childElement = xmlDoc.CreateElement("Child");
        XmlText childText = xmlDoc.CreateTextNode("Hello, world!");
        childElement.AppendChild(childText);
        rootElement.AppendChild(childElement);
        xmlDoc.AppendChild(xmlDeclaration);
        xmlDoc.AppendChild(rootElement);

        // 将XmlDocument对象转换为XML字符串
        StringWriter sw = new StringWriter();
        XmlTextWriter xmlWriter = new XmlTextWriter(sw);
        xmlDoc.WriteTo(xmlWriter);
        string xmlString = sw.ToString();

        // 设置响应的内容类型为text/xml
        Response.ContentType = "text/xml";

        // 将XML字符串写入响应流并结束响应
        Response.Write(xmlString);
        Response.End();
    }
}