DesktopHelper.Util.CheckUpdate.Download C# (CSharp) Method

        public bool Download()
        {
            bool success = false;
            try
            {
                if (!Directory.Exists(Application.StartupPath + @"\Update"))
                {
                    Directory.CreateDirectory(Application.StartupPath + @"\Update");
                }
                string url = "http://www.andwho.com/AndwhoUpdate/DeskHelper/DeskHelper.xml";
                Uri uri = new Uri(url);
                HttpWebRequest mRequest = (HttpWebRequest)WebRequest.Create(uri);
                mRequest.Method = "GET";
                mRequest.ContentType = "application/x-www-form-urlencoded";
                HttpWebResponse mResponse = (HttpWebResponse)mRequest.GetResponse();
                Stream sIn = mResponse.GetResponseStream();
                FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);
                long length = mResponse.ContentLength;
                long i = 0;

                while (i < length)
                {
                    byte[] buffer = new byte[length];
                    int read = sIn.Read(buffer, 0, buffer.Length);
                    i += read;

                    string strTemp = System.Text.Encoding.UTF8.GetString(buffer, 0, read);
                    byte[] bytes = System.Text.Encoding.UTF8.GetBytes(strTemp);

                    fs.Write(bytes, 0, bytes.Length);
                }
                sIn.Close();
                mResponse.Close();
                fs.Close();
                success = true;
            }
            catch
            {
            }
            return success;
        }

 //检查更新
 private void UpdateToolStripMenuItem_Click(object sender, EventArgs e)
 {
     try
     {
         _checkUpdate = new CheckUpdate();
         if (_checkUpdate.IsConnectedInternet())
         {
             if (_checkUpdate.Download())
             {
                 if (_checkUpdate.HasNewVersion())
                 {
                     form_Update = UpdateForm.GetInstance(_checkUpdate.NewVersion);
                     form_Update.CloseHandlor += new UpdateForm.CloseHandler(CloseDeskHelper);
                     form_Update.ShowForm();
                 }
                 else//HasNewVersion()
                 {
                     MessageBox.Show("已经是最新版本");
                 }
             }
             else//Download()
             {
                 MessageBox.Show("已经是最新版本");
             }
         }
         else//IsConnectedInternet()
         {
             MessageBox.Show("本机没有连接互联网");
         }
     }
     catch (Exception ex)
     {
         log.WriteLog(ex.ToString());
     }
 }