这样的问题怎么解决呢？

using System;
using CBasic.Utility;
using CBasic.ForumsWebService;
using System.Net;
using System.IO;
using System.Text;
using System.Xml;

namespace CBasic.Web.UserControl
{
    public partial class User_Login : CBasic.Web.UserControlBase
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            LoginButton.OnClientClick = "getElement('loginStat').style.display='';var u=getElement('" + UserName.ClientID + "');var p=getElement('" + UserPassword.ClientID + "');return checkLogin(u.value,p.value)";
        }

        protected void Login_OnClick(object sender, EventArgs e)
        {
            if (!Validator.IsValidUserName(UserName.Text))
                MessageBox.AlertMsg("用户名格式不正确", null);
            if (!Validator.IsValidPassword(UserPassword.Text))
                MessageBox.AlertMsg("密码格式不正确", null);

            string username = UserName.Text;
            string password = Text.MD5(UserPassword.Text, 16);

            //Response.Write(Login(Config.Web.ForumsApiKeys, username, password));
            //Response.End();

            BLL.Passport passport = new BLL.Passport();
            if (passport.MemberLogin(username, password) == null)
                MessageBox.AlertMsg("您输入的用户不存在或密码错误", null);

            //远程登录
            //MemberPassport ws = new MemberPassport();
            //string sysKey = Config.Web.ForumsApiKeys;
            //string r = ws.Login(sysKey, username, password);
            //Response.Write(r);
            //Response.Write("dv_dpo.asp?syskey=" + Text.MD5(username+sysKey, 16) + "&UserName=" + username + "&Password=" + password);//469e80d32c0559f8");
            //Response.End();
            //登录结束

            Response.Redirect(FromUrl, true);
        }

        private string Login(string sysKey, string userName, string password)
        {
            string param = "syskey=" + sysKey + "&UserName=" + userName + "&Password=" + password + "&savecookie=0";
            byte[] bs = Encoding.UTF8.GetBytes(param);
            //Response.ContentType = "text/xml";
            XmlDocument doc = new XmlDocument();
            string xmlPath = Server.MapPath("~/api_user.xml");
            doc.Load(xmlPath);

            XmlNode root = doc.SelectSingleNode("/root");
            root.SelectSingleNode("action").InnerText = "login";
            root.SelectSingleNode("syskey").InnerText = sysKey;
            root.SelectSingleNode("username").InnerText = userName;
            root.SelectSingleNode("password").InnerText = password;

            sysKey = Text.MD5(userName + sysKey, 16);
            string url = "http://bbssilk.zsjdc.com/dv_dpo.asp";
            
            //GET
            WebRequest wr = WebRequest.Create(url + "?" + param);
            wr.Method = "GET";
            //wr.ContentType = "application/x-www-form-urlencoded";
            //wr.ContentLength = bs.Length;
            
            //POST发送数据
            /*
            using (StreamWriter sw = new StreamWriter(wr.GetRequestStream(), Encoding.UTF8))
            {
                sw.Write(doc.OuterXml);
                sw.Close();
            }
            */

            //接收数据
            WebResponse response = wr.GetResponse();
            Stream stream = response.GetResponseStream();
            StreamReader sr = new StreamReader(stream, Encoding.UTF8);
            string result = sr.ReadToEnd();
            sr.Close(); sr.Dispose();
            stream.Close(); stream.Dispose();
            //Response.Write(url + "::" + result);
            //Response.End();
            if (string.IsNullOrEmpty(result))
                return string.Empty;
            return result;
        }

        private string FromUrl
        {
            get
            {
                string url = Request.QueryString["from"];
                if (string.IsNullOrEmpty(url)) return string.Format("{0}User/index{1}", CBasic.Web.Page.WebSite, CBasic.Web.Page.FileExtName);
                return Server.UrlDecode(url);
            }
        }
    }
}

高手指点呀！谢谢 --------------------编程问答-------------------- 贴出MessageBox.AlertMsg这个方法的代码 --------------------编程问答-------------------- 乱码，注意字符编码啊！

补充：.NET技术 ,  ASP.NET