C#文件上传和文件下载

 #region 文件上传
    private void UpLoadFile(string fileName, string fileNamePath, string uriString)
    {
        string NewFileName = DateTime.Now.ToString("yyMMddhhmmss") + DateTime.Now.Millisecond.ToString() + fileNamePath.Substring(fileNamePath.LastIndexOf(".")); string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + );
        if (uriString.EndsWith("/") == false)
            uriString = uriString + "/";
        uriString = uriString + NewFileName;
        WebClient myWebClient = new WebClient();
        myWebClient.Credentials = CredentialCache.DefaultCredentials;
        FileStream fs = new FileStream(fileNamePath, FileMode.Open, FileAccess.Read); BinaryReader r = new BinaryReader(fs);
        try
        {
            byte[] postArray = r.ReadBytes((int)fs.Length); Stream postStream = myWebClient.OpenWrite(uriString, "PUT");
            if (postStream.CanWrite) { postStream.Write(postArray, , postArray.Length); }
            else { MessageBox.Show("文件目前不可写！"); } postStream.Close();
        }
        catch (Exception ex) { MessageBox.Show(ex.Message); }
    }
    #endregion  

    #region C#下载服务器文件至客户端的代码：
    public void Download(string URL, string Dir)
    {
        WebClient client = new WebClient(); string fileName = URL.Substring(URL.LastIndexOf("\\") + );
        //被下载的文件名
        string Path = Dir + fileName;
        //另存为的绝对路径＋文件名
        try { WebRequest myre = WebRequest.Create(URL); }
        catch
        {
            MessageBox.Show(exp.Message, "Error");
        }
        try { client.DownloadFile(URL, Path); }
        catch { MessageBox.Show(exp.Message, "Error"); }
    }  

    #endregion