Download File Class

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


namespace Download_Manager
{
    class DownloadFiles
    {
        public List<Uri> downloadQueue = new List<Uri>();

        //Index of file in queue to download
        int fileToDownloadIndex;

        //download percentage
        int percent;
        //file size
        int totalBytesToRecieve;

        bool isDownloadComplete;

        string downloadPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"\Files";

        public int FileToDownloadIndex
        {
            get { return fileToDownloadIndex; }
            set { fileToDownloadIndex = value; }
        }
        public int Percent
        {
            get { return percent; }
            set { percent = value; }
        }
        public int TotalBytesToRecieve
        {
            get { return totalBytesToRecieve; }
            set { totalBytesToRecieve = value; }
        }
        public bool IsDownloadComplete
        {
            get { return isDownloadComplete; }
            set { isDownloadComplete = value; }
        }

        private string getContentType(Uri url)
        {
            string contentType = "";

            try
            {
                var request = HttpWebRequest.Create(url);

                using (var response = request.GetResponse())
                {

                    contentType = response.ContentType;
                }

            }
            catch (WebException)
            {
                MessageBox.Show("Error fetching file extension");

            }

            return contentType;
        }


        private void downloadFile(Uri url)
        {



            //if (string.IsNullOrEmpty(contentType))
            //{
                //MessageBox.Show("Error fetching file extension. Would you like to manually set it?");
                //TO DO
            //}
            //else
            {
                if (!Directory.Exists(downloadPath))
                {
                    Directory.CreateDirectory(downloadPath);
                }

                try
                {
                    using (WebClient wb = new WebClient())
                    {

                        wb.DownloadProgressChanged += new DownloadProgressChangedEventHandler(progressChanged);
                        wb.DownloadFileCompleted += downloadCompleted;
                        string contentType = getContentType(url);
                        string fileExtension = contentType.Substring(contentType.IndexOf('/') + 1);
                        wb.DownloadFileAsync(url, downloadPath + @"\" + fileToDownloadIndex.ToString() + "." + fileExtension);
                        //wb.DownloadFileAsync(url, downloadPath + @"\" + fileToDownloadIndex.ToString() + "." + "zip");

                    }
                }

                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
        private void progressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            //download percentage
            percent = Convert.ToInt32(e.BytesReceived);
            //size of file
            totalBytesToRecieve = Convert.ToInt32(e.TotalBytesToReceive);
        }
        private void downloadCompleted(object sender, EventArgs e)
        {
            //Number of urls in Queue
            int urlCount = downloadQueue.Count - 1;

            if (fileToDownloadIndex != urlCount)
            {
                fileToDownloadIndex++;
                downloadFile(downloadQueue[fileToDownloadIndex]);

            }
            else
            {
                isDownloadComplete = true;
                percent = 0;
                totalBytesToRecieve = 0;
                fileToDownloadIndex = 0;
                downloadQueue.Clear();
            }
        }

        public void startDownload()
        {
            downloadFile(downloadQueue[FileToDownloadIndex]);
        }

    }
}