public MainWindow()
        {
            InitializeComponent();
            backgroundWorker.DoWork += backgroundWorker_DoWork;

            image1.MouseDown += new MouseButtonEventHandler(image1_MouseDown);
            image1.MouseUp += new MouseButtonEventHandler(image1_MouseUp);
            image1.MouseMove += new MouseEventHandler(image1_MouseMove);

            //backgroundWorker.RunWorkerCompleted += backgroundWorker_RunWorkerCompleted;
        }


        private void image1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isMouseDown)
            {
                pointEnd = new Point(e.GetPosition(this.image1).X, this.image1.Height);
                DrawRect(pointEnd);
            }
        }

        private void image1_MouseUp(object sender, MouseButtonEventArgs e)
        {
           if (isMouseDown)
            {
                isMouseDown = false;
                pointEnd = new Point(e.GetPosition(this.image1).X, this.image1.Height);

                DrawRect(pointEnd);
            }
        }

        private void image1_MouseDown(object sender, MouseButtonEventArgs e)
        {
            isMouseDown = true;

            pointStart = new Point(e.GetPosition(this.image1).X, 0);

            if (mainCanvas.Children.Count == 2)
                rectBase = mainCanvas.Children.OfType<Rectangle>().First();
            else
                rectBase = new Rectangle();

            SolidColorBrush brushRegionRectangle = new SolidColorBrush(Colors.Chocolate);

            rectBase.Stroke = brushRegionRectangle;
            rectBase.StrokeThickness = 2;
            rectBase.Fill = new SolidColorBrush(Colors.Black);
            rectBase.Opacity = 0.2;

            if (mainCanvas.Children.Count == 1)
                this.mainCanvas.Children.Add(rectBase);
        }