Upload file and directory with ftp filezilla in winforms app c#

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C#

WinForms

FTP

Greeting all ,
I'm trying to upload directories and files from my computer to a server via ftp and filezilla with c# , winforms application .
Here is my code , I have an error that I can't solve it :

////INST : liste des directories Sources
 string[] Dir_N1 = { dirBin, dirContent, dirCulture, dirImages, dirLayout, dirPages, dirUserControls, dirXmlconfig };


 ////LOOP : parcourir  les reprertoires niveau1
 foreach (string d in Dir_N1)
 {

     DirectoryInfo dir = new DirectoryInfo(filePath + d);
     FileInfo[] files = dir.GetFiles();
     foreach (FileInfo file in files)
     {
         string URI = "ftp://" + ServerName.InnerText + "//TestDeploy" + d + file.Name;
         FtpWebRequest request = (FtpWebRequest)WebRequest.Create(URI);
         request.Credentials = new NetworkCredential(UserName.InnerText, Password.InnerText);


         // Copy the entire contents of the file to the request stream.


         StreamReader sourceStream = new StreamReader(file.FullName);
         request.Method = WebRequestMethods.Ftp.MakeDirectory;
         request.Method = WebRequestMethods.Ftp.UploadFile;
         byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
         sourceStream.Close();
         request.ContentLength = fileContents.Length;

         // Upload the file stream to the server.
         Stream requestStream = request.GetRequestStream();
         requestStream.Write(fileContents, 0, fileContents.Length);
         requestStream.Close();

         // Get the response from the FTP server.
         FtpWebResponse response = (FtpWebResponse)request.GetResponse();

         // Close the connection
         response.Close();
     }
 }

The error is :
Stream requestStream = request.GetRequestStream();
Le serveur distant a retourné une erreur : (550) Fichier non disponible (par exemple, fichier introuvable, accès impossible).

Any Help please !
Thanks in advance