C # WinForm File upload download

/// <summary>  ///WebClient uploading files to the server/// </summary>  /// <param name= "Filenamepath" >file name, full path format</param>  /// <param name= "uristring" >Server folder path</param>  Private voidUploadFile (stringFilenamepath,stringuristring) {   stringFileName = filenamepath.substring (Filenamepath.lastindexof ("\\") +1); NewFileName= DateTime.Now.ToString ("Yymmddhhmmss") + DateTime.Now.Millisecond.ToString () + filenamepath.substring (Filenamepath.lastindexof (".")); stringFilenameext = filename.substring (Filename.lastindexof (".") +1); if(Uristring.endswith ("/") ==false) uristring = uristring +"/"; Uristring= uristring +NewFileName; ///creating an WebClient instanceWebClient mywebclient =NewWebClient (); Mywebclient.credentials=CredentialCache.DefaultCredentials; //the file to uploadFileStream fs =NewFileStream (FileName, FileMode.Open, FileAccess.Read); //FileStream fs = OpenFile ();BinaryReader r =NewBinaryReader (FS); Try   {    //You can use the UploadFile method in the following format//Mywebclient.uploadfile (uristring, "PUT", Filenamepath);    byte[] Postarray = R.readbytes ((int) fs.    Length); Stream Poststream= Mywebclient.openwrite (uristring,"PUT"); if(poststream.canwrite) {poststream.write (Postarray,0, postarray.length); }    Else{AppHelper.MessageService.ShowError ("The file is not currently writable! ");   } poststream.close (); }   Catch{AppHelper.MessageService.ShowError ("File upload failed, please retry ~"); }  }  /// <summary>  ///download server files to client/// </summary>  /// <param name= "URL" >downloaded file address, absolute path</param>  /// <param name= "Dir" >another directory to store</param>   Public voidDownload (stringUrlstringDir) {WebClient Client=NewWebClient (); stringFileName = URL. Substring (URL. LastIndexOf ("\\") +1);//the file name that was downloaded   stringPath = Dir+filename;//Save As absolute path + file name      Try{WebRequest Myre=WebRequest.Create (URL); }   Catch   {    //MessageBox.Show (exp. Message, "Error");    }      Try{client.    DownloadFile (Url,filename); FileStream FS=NewFileStream (FileName, FileMode.Open, FileAccess.Read); BinaryReader R=NewBinaryReader (FS); byte[] MByte = R.readbytes ((int) fs.    Length); FileStream Fstr=NewFileStream (Path,filemode.openorcreate,fileaccess.write); Fstr. Write (MByte,0,(int) fs.    Length); Fstr.    Close (); }    Catch   {    //MessageBox.Show (exp. Message, "Error");   }   }  

C # WinForm File upload download