Simple File Upload using FTP and C#.NET

using System.Net;

using System.IO;

private void UploadToFTP(string filename)

{

    try

    {

       FileInfo fileInf = new FileInfo(filename);

       string uri = ftpAddress + fileInf.Name;

       FtpWebRequest reqFTP;

       // Create FtpWebRequest object from the Uri provided

 reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri(ftpAddress

+ fileInf.Name));

       // Provide the WebPermission Credintials

       reqFTP.Credentials = new NetworkCredential(ftpUser,ftpPassword);

       // By default KeepAlive is true, where the control connection is

       // not closed after a command is executed.

       reqFTP.KeepAlive = false;

       // Specify the command to be executed.

       reqFTP.Method = WebRequestMethods.Ftp.UploadFile;

       // Specify the data transfer type.

       reqFTP.UseBinary = true;

       // Notify the server about the size of the uploaded file

       reqFTP.ContentLength = fileInf.Length;

       // The buffer size is set to 2kb

       int buffLength = 2048;

       byte[] buff = new byte[buffLength];

       int contentLen;

       // Opens a file stream (System.IO.FileStream) to read

       //the file to be uploaded

       FileStream fs = fileInf.OpenRead();

       try

       {

          // Stream to which the file to be upload is written

          Stream strm = reqFTP.GetRequestStream();

          // Read from the file stream 2kb at a time

          contentLen = fs.Read(buff, 0, buffLength);

          // Till Stream content ends

          while (contentLen != 0)

          {

               // Write Content from the file stream to the

               // FTP Upload Stream

               strm.Write(buff, 0, contentLen);

               contentLen = fs.Read(buff, 0, buffLength);

          }

          // Close the file stream and the Request Stream

          strm.Close();

          fs.Close();

       }

       catch (Exception ex)

       {

            //MessageBox.Show(ex.Message, "FTP File Upload Error");

            throw new Exception(ex.Message);

       }

    }

    catch (Exception ex)

    {

      //MessageBox.Show(ex.Message, "FTP File Upload Error");

      throw new Exception(ex.Message);

    }

 }

N.B.: Make sure that u have proper permission to create file in FTP. 
address like: ftp://1.1.1.1/fileFolder/