update

void update(string dllName)
        {
            string fileName = currentAppPath + "\\" + dllName;
            string url = serverPath + "/" + dllName;
            try
            {
                WebRequest myWebRequest = WebRequest.Create(url);
                WebResponse myWebResponse = myWebRequest.GetResponse();

                Stream receiveStream = myWebResponse.GetResponseStream();
                //彆狟徭腔偶靡嘐隅珂壺ㄛ婬?ㄛ瘁?奧隅
                File.Delete(fileName);
                FileStream fs = new FileStream(fileName, FileMode.CreateNew);

                try
                {
                    List<byte> lstByte = new List<byte>();
                    while (true)
                    {
                        //莮珨?byte, ?珨?byte
                        int i = receiveStream.ReadByte();

                        if (i == -1)
                        {
                            break;
                        }

                        fs.WriteByte(Convert.ToByte(i));
                    }
                }
                finally
                {
                    if (fs != null)
                        fs.Close();
                    myWebResponse.Close();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                WebRequest.DefaultWebProxy = null;
            }
        }