[Help]How to make your own auto patcher?

    public class Autopatcher
    {
        /// <summary>
        /// The url.
        /// </summary>
        private string m_url;

        /// <summary>
        /// Get's the URL of the autopatcher.
        /// </summary>
        /// <returns>The correct url.</returns>
        public string GetURL()
        {
            return (m_url.EndsWith("/") ? m_url : m_url + "/");
        }

        /// <summary>
        /// Creating a new instance of an autopatcher.
        /// </summary>
        /// <param name="URL">The url where the patches are located. Ex. http://127.0.0.1/autopatcher/ </param>
        public Autopatcher(string URL)
        {
            m_url = URL;
        }

        /// <summary>
        /// The progress percentage.
        /// </summary>
        private int Progress = 0;

        /// <summary>
        /// Get's the progress percentage of the patching.
        /// </summary>
        /// <returns>The progress percentage.</returns>
        public int GetProgress()
        {
            return Progress;
        }

        /// <summary>
        /// The current patch.
        /// </summary>
        private int CurrentPatch;

        /// <summary>
        /// Get's the current patch.
        /// </summary>
        /// <returns>The current patch.</returns>
        public int GetCurrentPatch()
        {
            return CurrentPatch;
        }

        /// <summary>
        /// The patch result.
        /// </summary>
        private PatchResult Result;

        /// <summary>
        /// Get's the current patch result.
        /// </summary>
        /// <returns>The patch result.</returns>
        public PatchResult GetLastResult()
        {
            return Result;
        }

        /// <summary>
        /// Begins a new patch download.
        /// </summary>
        /// <param name="_CurrentPatch">The current patch to download.</param>
        public void BeginPatch(int _CurrentPatch)
        {
            CurrentPatch = _CurrentPatch;
            Result = Patch();
        }

        /// <summary>
        /// This method is called from BeginPatch(int) and will return Result.
        /// </summary>
        /// <returns>Result</returns>
        private PatchResult Patch()
        {
            Result = new PatchResult();
            try
            {
                Result.Error = false;
                

                WebClient client = new WebClient();
                int targetpatch = int.Parse(client.DownloadString(GetURL() + "version.dat"));

                if (targetpatch > CurrentPatch)
                {
                    Result.UpToDate = false;
                    Uri uri = new Uri(m_url + CurrentPatch + "/");
                    client.DownloadFileAsync(uri, CurrentPatch + ".rar");
                    client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(BeginProgress);
                    client.DownloadFileCompleted += new AsyncCompletedEventHandler(BeginEndPatch);
                }
                else
                    Result.UpToDate = true;

                return Result;
            }
            catch (Exception e)
            {
                Result.Error = true;
                Result.exception = e;
                return Result;
            }
        }

        /// <summary>
        /// The progress event.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BeginProgress(object sender, DownloadProgressChangedEventArgs e)
        {
            Progress += e.ProgressPercentage;
        }

        /// <summary>
        /// The end event.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BeginEndPatch(object sender, AsyncCompletedEventArgs e)
        {
            CurrentPatch++;
            BeginPatch(CurrentPatch);
        }
    }

    public class PatchResult
    {
        public bool Error;
        public bool UpToDate;
        public Exception exception;
    }