FTP upload Download C #

 Public classMyftpclass {Private ReadOnly string_destip; Private ReadOnly string_username; Private ReadOnly string_password;  PublicMyftpclass (stringDesip,stringUserName,stringpassowrd) {             This. _destip =Desip;  This. _username =UserName;  This. _password =PASSOWRD; }        PrivateFtpWebRequest openrequest (Uri Uri,stringFtpmethod) {FtpWebRequest Request= WebRequest.Create (URI) asFtpWebRequest; if(Request! =NULL) {request. Credentials=NewNetworkCredential (_username, _password); Request. Usebinary=true; Request. Method=Ftpmethod; returnrequest; }            Else            {                return NULL; }                    }        PrivateFtpWebResponse openresponse (Uri Uri,stringFtpmethod) {FtpWebRequest Request= This.            OpenRequest (URI, Ftpmethod); if(Request! =NULL) {ftpwebresponse response= Request. GetResponse () asFtpWebResponse; returnresponse; }            Else            {                return NULL; }                                }        /// <summary>        ///local file path to upload/// </summary>        /// <param name= "Uploadfilepath" >shaped like: d:\\folder1\\2.jpg</param>        /// <param name= "Desname" >shape: 123.jpg or Subfolder1/123.jpg</param>        /// <returns></returns>         Public BOOLUpload (stringUploadfilepath,stringdesname) {Stream Requeststream=NULL; FtpWebResponse Response=NULL; Try{URI Uri=NewUri (string. Format ("Ftp://{0}/{1}", _destip, Desname)); FtpWebRequest Request=openrequest (URI, WebRequestMethods.Ftp.UploadFile); Requeststream=request.                GetRequestStream (); FileStream FS=File.Open (Uploadfilepath, FileMode.Open); byte[] Buff =New byte[1024x768]; intBuffread =0;  while(true)                {                    intn =FS. Read (Buff, buffread, buff.                    Length); if(n = =0)                    {                         Break; }                    //writes a file stream to the request streamrequestStream.Write (Buff,0, N); } Response=(ftpwebresponse) request.                GetResponse (); return true; }            Catch(Exception) {Throw NewException ("Upload file failed! "); }            finally{requeststream.close (); Response.            Close (); }                    }        /// <summary>        ///Download File/// </summary>        /// <param name= "Serverfilename" >the name of the file to download. Shape: 123.jpg or Subfolder1/123.jpg</param>        /// <param name= "LocalPath" >the path to the local download. Shaped like: d:\\a\\b\\</param>        /// <param name= "LocalName" >the name that is saved locally. Shape: 3.jpg</param>        /// <returns></returns>         Public BOOLDownload (stringServerfilename,stringLocalPath,stringlocalname) {Stream Responsestream=NULL; FileStream FileStream=NULL; Try{URI Uri=NewUri (string. Format ("Ftp://{0}/{1}", _destip, Serverfilename)); FtpWebResponse Downloadresponse=openresponse (URI, WebRequestMethods.Ftp.DownloadFile); Responsestream=Downloadresponse.getresponsestream (); FileStream= File.create (LocalPath +localname); byte[] buffer =New byte[1024x768];  while(true)                {                    varBytesread = responsestream.read (buffer,0, buffer.                    Length); if(Bytesread = =0)                         Break; //write a response stream to a fileFileStream.Write (Buffer,0, Bytesread); }                                return true; }            Catch            {                Throw NewException ("failed to get download file! "); }            finally{filestream.close ();            Responsestream.close (); }        }    }

Note the read-out and write issues for stream files :
For example

int n =  FS. Read (Buff, buffread, buff. Length);
Bufferread and Buff.length refer to the index and length of the array buff.
Stream file FS automatically maintains a pointer position that automatically moves back n bytes whenever read n bytes.

FileStream.Write (buffer, 0, bytesread); 

FTP upload Download C #