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(".") + 1);  
       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, 0, 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("\") + 1);  
       //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