如何让WebServer返回指的定XML内容

/*CheckLogin服务*/

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using System;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using mysql.SQL;
using myfunc.Common;

/// <summary>
/// CheckLogin 的摘要说明
/// </summary>
[WebService(Namespace = "http://localhost/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class CheckLogin : System.Web.Services.WebService { 网管网www.bitscn.com

    public CheckLogin () { 网管联盟bitsCN@com

        //如果使用设计的组件，请取消注释以下行
        //InitializeComponent();
    } 网管论坛bbs_bitsCN_com

    //[WebMethod(Description = "Login", EnableSession = true)]
    [WebMethod]
    public checkuser Login(string sUserCode, string sPassword)
    {
        checkuser objcheckuser= new checkuser();
        string sCheckLogin = ConfigurationManager.AppSettings["strCheckLogin"];
        SqlShell objShell = new SqlShell();
        SqlCommand objCommand = new SqlCommand(sCheckLogin);
        objCommand.CommandType = CommandType.Text;
        objCommand.Parameters.AddWithValue("@sUserCode", sUserCode);
        objCommand.Parameters.AddWithValue("@sPassword", sPassword);
        DataTable objDataTable = objShell.executeDataSet(ref objCommand).Tables[0];

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            //检查Allow字段是否为空
            if (objDataRow.IsNull("Allow")) { objcheckuser.allow = ""; }
            else { objcheckuser.allow = objDataRow["Allow"].ToString().Trim(); } 网管联盟bitsCN@com

            menulist objmenulist = new menulist(objDataRow["UserID"].ToString().Trim());
            objcheckuser.menuxml = objmenulist.buf;//返回菜单列表的XML字符串
                 

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        }
        return objcheckuser;

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    }

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    public class checkuser
    {
        public bool logined;
        public string userid;
        public string pass;
        public string username;
        public string allow;
        public string menuxml;//返回菜单列表的XML字符串

    }

}

/*CheckLogin服务结束*/

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