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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public delegate void DelegateUpdateProgressBar(int max);

        public event DelegateUpdateProgressBar EventUpdateProgressBar;

        public Form1()
        {
            InitializeComponent();
            EventUpdateProgressBar += new DelegateUpdateProgressBar(UpdateProgressBarMethode);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            CenterToScreen();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string _host = HostBox.Text;
            string _port = PortBox.Text;
            string _username = UsernameBox.Text;
            string _password = PasswordBox.Text;
            string _filepath = FilepathBox.Text;
            ResponseBox.Text += _filepath + ": " + FTPUpload(_host, _port, _username, _password, _filepath) + Environment.NewLine;
        }

        public void UpdateProgressBarMethode(int max)
        {
            progressBar1.Maximum = max;
            progressBar1.Step = 1;
            progressBar1.PerformStep();
        }

        private string FTPUpload(string _host, string _port, string _username, string _password, string _filepath)
        {
            string _rvalue = "";
            //check if file exists on local machine
            if (File.Exists(_filepath) == true)
            {
                try
                {
                    //create file information object
                    FileInfo myFile = new FileInfo(_filepath);

                    //create a byte array as a buffer that contains the file content
                    FileStream fs = myFile.OpenRead();
                    byte[] file_buffer = new byte[fs.Length];
                    fs.Read(file_buffer, 0, file_buffer.Length);
                    fs.Close();

                    //create uniform ressouce identifier
                    Uri _uri = new Uri("ftp://" + _host + ":" + _port + "/" + myFile.Name);

                    //create the ftp object
                    FtpWebRequest ftp = (FtpWebRequest)FtpWebRequest.Create(_uri);
                    ftp.Credentials = new NetworkCredential(_username, _password);
                    ftp.Method = WebRequestMethods.Ftp.UploadFile;

                    //check connection
                    FtpWebResponse response = (FtpWebResponse)ftp.GetResponse();
                    _rvalue = response.StatusDescription;

                    //upload the buffer array by using the ftp upload stream
                    Stream upload_stream = ftp.GetRequestStream();
                    int max = file_buffer.Length;
                    int start = 0;

                    //upload the stream
                    while (start != max)
                    {
                        upload_stream.Write(file_buffer, start, 1);
                        start++;
                        EventUpdateProgressBar(max);
                        Application.DoEvents();
                    }

                    //close the stream
                    upload_stream.Close();
                }
                catch (Exception e)
                {
                    _rvalue = e.Message;
                }
            }
            else
            {
                _rvalue = "file not found!";
            }
            return _rvalue;
        }
    }
}