Fetches data (images,description) from an external web service asynchronous.

AsyncLoad

 public partial class Main : Form
    {
        private CheckInternetConnection iconn;
        private const string ERROR_LOADING_IMAGE = "Kunde inte ladda bild!\n Välj 'Ladda om' i Meny ovan ellr vänta 30 sec.!";
        private const string ERROR_IMAGE_DATA = "Bilden hittades ej eller är korrupt!\n Välj 'Ladda om' i Meny ovan ellr vänta 30 sec.!";
        private const string ERROR_NO_NETWORK_ACCESS = "iBrowser hittar inte internet!";
        private const string MESSAGE_LOADING = "loading ...";

       
        
        public Main()
        {
            InitializeComponent();
            MainApplicationWorkProcess();
        }
        /// <summary>
        ///1. Turn off and despose Timer if is on.
        ///2. Hide panel with a Image on it.
        ///3. Show loading message.
        ///4. Check if the network is on.
        ///     4.1 If networ is off , show error msg do noting!
        ///     
        ///5. Get Image info
        ///6. Show panel when image is fetched and there are no errors.
        ///7. Init and turn timer on.
        /// </summary>
         private void MainApplicationWorkProcess()
         {
             if (timer1.Enabled)
             {
                 timer1.Stop();
                 timer1.Dispose();
             }
                       
             pnlShow.Visible = false;
             lblLoading.Visible = true;
             lblLoading.Text = MESSAGE_LOADING;

             iconn = new CheckInternetConnection();

            if (iconn.InternetConnected())
            {
                FetchImage fetchImage = new FetchImage();
                Model.Image _image = fetchImage.GetImage();
                if (_image != null)
                {
                    SetImage(_image);
                }
                else 
                {
                    lblLoading.Text = ERROR_IMAGE_DATA;
                }
            }
            else
            {
                lblLoading.Text = ERROR_NO_NETWORK_ACCESS;
            }
            //30 secs
            timer1.Interval = (3000) * 10;
            timer1.Enabled = true;
            timer1.Start();
            timer1.Tick += new EventHandler(laddaOmToolStripMenuItem_Click);
        }
        /// <summary>
        /// While image is loading show loading message.
        /// new Event AsyncCompleted has 
        /// </summary>
        /// <param name="_image"></param>
         private void SetImage(Model.Image _image)
         {
             
             lblComment.Text = _image.Comment;
             pictureBox1.WaitOnLoad = false;
             pictureBox1.LoadAsync(_image.Url);
             
             pictureBox1.LoadCompleted += new System.ComponentModel.AsyncCompletedEventHandler(pictureBox1_LoadCompleted);
         }
        /// <summary>
        /// When Limage is fetched show panel with comments to.
        /// If error during the work - show Error insted of Loading message
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
         private void pictureBox1_LoadCompleted(object sender, AsyncCompletedEventArgs e)
         {
             if (e.Error != null)
             {
                 lblLoading.Text = ERROR_LOADING_IMAGE;
             }
             else
             {
                 lblLoading.Visible = false;
                 pnlShow.Visible = true;
             }
         }
        /// <summary>
        /// Calll Om form
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void omToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Om _om = new Om();
            _om.Show();
        }
        /// <summary>
        /// Close the app
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void avslutaToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        /// <summary>
        /// Call for a new image via menu.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void laddaOmToolStripMenuItem_Click(object sender, EventArgs e)
        {
            MainApplicationWorkProcess();
        }