用C#做了个在线更新的程序，一般安装时可以使用，断点续传时出错

用C#做了个在线更新的程序，正常安装时可以使用，断点续传时出错
用C#做了个在线更新的程序，正常安装时可以正常更新软件，
但是断点续传时出错 提示无法显示错误消息，原因是无法找到包含此错误消息的可选资源程序集
在wince下双击该程序，提示该程序不是正常的WINCE程序 
代码如下:


  Application.DoEvents();
  float percent = 0;
  long totalBytes = 0;
  try
  {
  utils.writelogs("start");
  HttpWebRequest Myrq = (HttpWebRequest)HttpWebRequest.Create(ServerURL);
  HttpWebResponse myrp = (HttpWebResponse)Myrq.GetResponse();
  totalBytes = myrp.ContentLength;
  utils.writelogs(totalBytes.ToString());
  if (prog != null)
  {
  prog.Maximum = (int)totalBytes;
  }
  string sPath = System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase.ToString());
  long totalDownloadedByte=0;

  long lStartPos = 0;
  System.IO.FileStream fs; 
  Stream st = myrp.GetResponseStream();

  if (File.Exists(sPath + "\\updatefile.CAB"))
  {

  fs = new FileStream(sPath + "\\updatefile.CAB", FileMode.Open, FileAccess.ReadWrite);//File.OpenWrite(StrFileName);
  lStartPos = fs.Length;
  fs.Seek(lStartPos, SeekOrigin.Current); //移动文件流中的当前指针

  //fs = System.IO.File.OpenWrite(sPath + "\\updatefile.CAB");
  //lStartPos = fs.Length;
  //fs.Seek(lStartPos, System.IO.SeekOrigin.Current); //移动文件流中的当前指针 

  // so = new FileStream(sPath + "\\updatefile.CAB", FileMode.Append);
  //totalDownloadedByte = so.Length;

  utils.writelogs("断点续传从该地址开始:" + lStartPos.ToString());
  }else{
  fs = new FileStream(sPath + "\\updatefile.CAB", FileMode.Create);
  //long totalDownloadedByte = 0;
  lStartPos = 0; 


  //int osize1 = so.Read(by, 0, (int)by.Length);
   
  }
  utils.writelogs("istartpos:" + lStartPos);
  byte[] by = new byte[1024*200];
  int osize = st.Read(by, 0, (int)by.Length);
  utils.writelogs("osize"+osize.ToString());
  while (osize > 0)
  {
  lStartPos = osize + lStartPos;
  //System.Windows.Forms.Application.DoEvents();
  fs.Write(by, 0, osize);
  if (prog != null)
  {
  prog.Value = (int)lStartPos;
  }
  osize = st.Read(by, 0, (int)by.Length);
  percent = (float)lStartPos / (float)totalBytes * 100;
  int m = percent.ToString().IndexOf(".");
  if (m > 0)
  {
  this.label1.Text = "当前下载进度" + percent.ToString().Substring(0, m) + "%";
  }