小弟我写的下载文件代码如何没有后缀名啊

我写的下载文件代码怎么没有后缀名啊..
public ActionResult DownLoad() {

int id =Convert.ToInt32(Session["id"]);
Article article = resourceMangerServices.GetArticleById(id);
string directory = Server.MapPath("/FileUpdate");
string FilePath = directory + article.Attachment;
System.IO.FileInfo DownloadFile = new System.IO.FileInfo(FilePath);
Response.Clear();
Response.ContentType = "application/octet-stream ";
Response.AppendHeader("Content-Disposition ", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
Response.WriteFile(DownloadFile.FullName);
Response.Flush();
Response.End();
return new EmptyResult();

} 高手求解

------解决方案--------------------
定义个处理程序

<a href="/DownloadHandler.ashx?filename=111111">点击下载</a>

public class DownloadHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
HttpRequest Request = HttpContext.Current.Request;
HttpResponse Response = HttpContext.Current.Response;
string strDirectory = HttpContext.Current.Server.MapPath("~");

string strFilePath = strDirectory + context.Request.QueryString["filename"]; //真实文件地址
System.IO.FileInfo DownloadFile = new System.IO.FileInfo(strFilePath );
string strFileName = DownloadFile.Name;
byte[] datas = System.IO.File.ReadAllBytes(strFilePath);
Response.AddHeader("Content-Disposition", "attachment;filename= \"" + HttpUtility.UrlEncode(strFileName) + "\";");
Response.AddHeader("Content-Type", "text/html"); // 需修改
Response.OutputStream.Write(datas, 0, datas.Length);
}

public bool IsReusable
{
get
{
return false;
}
}
}

------解决方案--------------------

C# code

using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;

namespace Asiastar.NR.Ajax
{
    /// <summary>
    /// $codebehindclassname$ 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class Handler1 : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";

            string id = context.Request["id"].ToString();//获取资源的编号
            System.IO.Stream iStream = null;
            byte[] buffer = new Byte[10000];
            int length;
            long dataToRead;
            NRBLL.File bf = new Asiastar.NRBLL.File();
            Guid guid = new Guid(id);
            if (bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"] != null)//判断数据库路径是否存在         
            {
                string filepath = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString();//获取资源完整路径                   D:\资源文件\600cc139-14cf-448e-9e50-daa972d35e01.jpg
                string Oidfilename = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FileNam"].ToString();//旧文件名称
                //string filename = System.IO.Path.GetFileName(filepath);//获取文件名称+后缀名            600cc139-14cf-448e-9e50-daa972d35e01.JPG
                //int index = filepath.IndexOf(".");
                //string filetype = filepath.Substring(index).ToLower();//后缀名
                //string newfilename = Oidfilename;
                //string filepath1 = bf.FN_SerchPathByFileId(guid).Tables[0].Rows[0]["FilePath"].ToString().Substring(0,filepath.Length - 8);
                try
                {
                    string fileName = HttpUtility.UrlEncode(System.Text.Encoding.UTF8.GetBytes(Oidfilename));//解码(注意这里2层解码)
                    Oidfilename = Oidfilename.Replace("+", "%20");  //将“+”替换成“空格”
                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.Read);
                    dataToRead = iStream.Length;
                    context.Response.ContentType = "application/octet-stream";
                    context.Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(Oidfilename, System.Text.Encoding.UTF8));  //下载的时候下载原来的文件名称
                    while (dataToRead > 0)
                    {
                        if (context.Response.IsClientConnected)
                        {
                            length = iStream.Read(buffer, 0, 10000);
                            context.Response.OutputStream.Write(buffer, 0, length);
                            context.Response.Flush();
                            buffer = new Byte[10000];
                            dataToRead = dataToRead - length;
                        }
                        else
                        {
                            dataToRead = -1;
                        }
                    }

                }
                catch (Exception ex)
                {
                    NR.Error.Log.LogType(ex.ToString());
                }
                finally
                {
                    if (iStream != null)
                    {
                        iStream.Close();
                    }
                }
            }
            else
            {
                NR.Error.Log.LogType("找不到文件!");
            }
        }
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

小弟我写的下载文件代码如何没有后缀名啊

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