Windows Forms: How to Upload files with FTP in C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "FTPUpload" and then click OK

Step 2: Design your form as below

Step 3: Add code to handle your form

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

namespace FTPUpload
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        //Define a struct to store login
        struct FtpSetting
        {
            public string Server { get; set; }
            public string Username { get; set; }
            public string Password { get; set; }
            public string FileName { get; set; }
            public string FullName { get; set; }
        }

        FtpSetting _inputParameter;

        private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            string fileName = ((FtpSetting)e.Argument).FileName;
            string fullName = ((FtpSetting)e.Argument).FullName;
            string userName = ((FtpSetting)e.Argument).Username;
            string password = ((FtpSetting)e.Argument).Password;
            string server = ((FtpSetting)e.Argument).Server;
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri(string.Format("{0}/{1}", server, fileName)));
            request.Method = WebRequestMethods.Ftp.UploadFile;
            request.Credentials = new NetworkCredential(userName, password);
            Stream ftpStream = request.GetRequestStream();
            FileStream fs = File.OpenRead(fullName);
            byte[] buffer = new byte[1024];
            double total = (double)fs.Length;
            int byteRead = 0;
            double read = 0;
            do
            {
                if (!backgroundWorker.CancellationPending)
                {
                    //Upload file & update process bar
                    byteRead = fs.Read(buffer, 0, 1024);
                    ftpStream.Write(buffer, 0, byteRead);
                    read += (double)byteRead;
                    double percentage = read / total * 100;
                    backgroundWorker.ReportProgress((int)percentage);
                }
            }
            while (byteRead != 0);
            fs.Close();
            ftpStream.Close();
        }

        private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            lblStatus.Text = $"Uploaded {e.ProgressPercentage} %";
            progressBar.Value = e.ProgressPercentage;
            progressBar.Update();
        }

        private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            lblStatus.Text = "Upload complete !";
        }

        private void btnUpload_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog() { Multiselect = false, ValidateNames = true, Filter = "All files|*.*" })
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    FileInfo fi = new FileInfo(ofd.FileName);
                    _inputParameter.Username = txtUserName.Text;
                    _inputParameter.Password = txtPassword.Text;
                    _inputParameter.Server = txtServer.Text;
                    _inputParameter.FileName = fi.Name;
                    _inputParameter.FullName = fi.FullName;
                    backgroundWorker.RunWorkerAsync(_inputParameter);
                }
            }
        }
    }
}

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