Page.Request.Files.Count问题！

在web里边Page.Request.Files.Count 获取的文件数量怎么是1啊！求高人指点这是源码：
  Response.CacheControl = "no-cache";
        string  s_rpath =@"E:\My Documents\Visual Studio 2008\WebSites\SWFUpload\demos\applicationdemo.net";
      
              
                string Datedir = DateTime.Now.ToString("yy-MM-dd"); 
                string updir = s_rpath + "\\" + Datedir;
                //string tempFile = Request.PhysicalApplicationPath;
                if (this.Page.Request.Files.Count > 0)
                {
                    try
                    {                        for (int j = 0; j < this.Page.Request.Files.Count; j++)
                        {                            HttpPostedFile uploadFile = this.Page.Request.Files[j];                            if (uploadFile.ContentLength > 0)
                            {
                                if (!Directory.Exists(updir))
                                {
                                    Directory.CreateDirectory(updir);
                                }
                                string extname = Path.GetExtension(uploadFile.FileName);
                                string fullname=DateTime.Now.Year.ToString()+DateTime.Now.Month.ToString()+DateTime.Now.Day.ToString()+ DateTime.Now.Hour.ToString()+DateTime.Now.Minute.ToString()+DateTime.Now.Second.ToString();
                                string filename = uploadFile.FileName;                                uploadFile.SaveAs(string.Format("{0}\\{1}", updir, filename));
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        Response.Write("Message"+ ex.ToString());
                    }           
        }