Windows Forms: Internet Download Manager in C# Part 2

Step 5: Open user settings, create a path property to store your path

Add code to handle frmSetting form

namespace DownloadManager
{
    public partial class frmSetting : Form
    {
        public frmSetting()
        {
            InitializeComponent();
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {
            //Open the folder dialog, allowing you to select the path
            using(FolderBrowserDialog fbd = new FolderBrowserDialog() { Description="Select your path." })
            {
                if (fbd.ShowDialog() == DialogResult.OK)
                    txtPath.Text = fbd.SelectedPath;
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(txtPath.Text))
            {
                //Save path to user settings
                Properties.Settings.Default.Path = txtPath.Text;
                Properties.Settings.Default.Save();
                this.Close();
            }
            else
                MessageBox.Show("Please select your path.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

Add code to handle frmAddUrl form

namespace DownloadManager
{
    public partial class frmAddUrl : Form
    {
        public frmAddUrl()
        {
            InitializeComponent();
        }

        public string Url { get; set; }

        //Get url from textbox
        private void btnOK_Click(object sender, EventArgs e)
        {
            this.Url = txtUrl.Text;
        }
    }
}

Add code to handle frmDownload form

namespace DownloadManager
{
    public partial class frmDownload : Form
    {
        public frmDownload()
        {
            InitializeComponent();
        }

        public frmDownload(frmMain frm)
        {
            InitializeComponent();
            _frmMain = frm;
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            //Get path and download file from internet
            Uri uri = new Uri(this.Url);
            FileName = System.IO.Path.GetFileName(uri.AbsolutePath);
            client.DownloadFileAsync(uri, Properties.Settings.Default.Path + "/" + FileName);
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            client.CancelAsync();
        }

        private void btnBrowse_Click(object sender, EventArgs e)
        {
            using(FolderBrowserDialog fbd = new FolderBrowserDialog() { Description = "Select your path." })
            {
                if (fbd.ShowDialog() == DialogResult.OK)
                {
                    txtPath.Text = fbd.SelectedPath;
                    Properties.Settings.Default.Path = txtPath.Text;
                    Properties.Settings.Default.Save();
                }
            }
        }

        WebClient client;
        public string Url { get; set; }
        public string FileName { get; set; }
        public double FileSize { get; set; }
        public double Percentage { get; set; }
        private frmMain _frmMain;

        private void frmDownload_Load(object sender, EventArgs e)
        {
            client = new WebClient();
            client.DownloadProgressChanged += Client_DownloadProgressChanged;
            client.DownloadFileCompleted += Client_DownloadFileCompleted;
            txtAddress.Text = Url;
            txtPath.Text = Properties.Settings.Default.Path;
        }

        private void Client_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            //Save download information to dataset
            Database.FilesRow row = App.DB.Files.NewFilesRow();
            row.Url = Url;
            row.FileName = FileName;
            row.FileSize = (string.Format("{0:0.##} KB", FileSize / 1024));
            row.DateTime = DateTime.Now;
            App.DB.Files.AddFilesRow(row);
            App.DB.AcceptChanges();
            App.DB.WriteXml(string.Format("{0}/data.dat", Application.StartupPath));
            ListViewItem item = new ListViewItem(row.Id.ToString());
            item.SubItems.Add(row.Url);
            item.SubItems.Add(row.FileName);
            item.SubItems.Add(row.FileSize);
            item.SubItems.Add(row.DateTime.ToLongDateString());
            _frmMain.listView1.Items.Add(item);
            this.Close();
        }

        private void Client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            //Update progress bar
            progressBar.Minimum = 0;
            double receive = double.Parse(e.BytesReceived.ToString());
            FileSize = double.Parse(e.TotalBytesToReceive.ToString());
            Percentage = receive / FileSize * 100;
            lblStatus.Text = $"Downloaded {string.Format("{0:0.##} %", Percentage)}";
            progressBar.Value = int.Parse(Math.Truncate(Percentage).ToString());
            progressBar.Update();
        }
    }
}

Add code to handle frmMain form

namespace DownloadManager
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        private void tsSetting_Click(object sender, EventArgs e)
        {
            using(frmSetting frm = new frmSetting())
            {
                frm.ShowDialog();
            }
        }

        private void tsAddUrl_Click(object sender, EventArgs e)
        {
            using(frmAddUrl frm = new frmAddUrl())
            {
                if(frm.ShowDialog() == DialogResult.OK)
                {
                    frmDownload frmDownload = new frmDownload(this);
                    frmDownload.Url = frm.Url;
                    frmDownload.Show();
                }
            }
        }

        private void tsRemove_Click(object sender, EventArgs e)
        {
            if(MessageBox.Show("Are you sure want to delete this record ?", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                for(int i = listView1.SelectedItems.Count; i > 0; i--)
                {
                    ListViewItem item = listView1.SelectedItems[i - 1];
                    App.DB.Files.Rows[item.Index].Delete();
                    listView1.Items[item.Index].Remove();
                }
                //Save dataset to file
                App.DB.AcceptChanges();
                App.DB.WriteXml(string.Format("{0}/data.dat", Application.StartupPath));
            }
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            //Load data from file to dataset
            string fileName = string.Format("{0}/data.dat", Application.StartupPath);
            if (File.Exists(fileName))
                App.DB.ReadXml(fileName);
            foreach(Database.FilesRow row in App.DB.Files)
            {
                ListViewItem item = new ListViewItem(row.Id.ToString());
                item.SubItems.Add(row.Url);
                item.SubItems.Add(row.FileName);
                item.SubItems.Add(row.FileSize);
                item.SubItems.Add(row.DateTime.ToLongDateString());
                listView1.Items.Add(item);
            }
        }
    }
}

VIDEO TUTORIALS