UPLOAD FILE TO FTP SERVER

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Net;
using System.IO;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Upload(string filename)
        {

            FileInfo fileInf = new FileInfo(filename);

            string uri = uri = "ftp://" + textBox2.Text + "/" + fileInf.Name;

            FtpWebRequest reqFTP;

            // Create FtpWebRequest object from the Uri provided

            reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftp://" + textBox2.Text + "/" + filename));

            // Provide the WebPermission Credintials

            reqFTP.Credentials = new NetworkCredential(textBox3.Text, maskedTextBox1.Text);

            // 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, "Upload Error");

            }

        }
        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog(); 
        }

        private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
        {
            textBox1.Text = openFileDialog1.FileName;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Upload(textBox1.Text);
        }
    }
}