private void winformsMap1_MapClick(object sender, MapClickWinformsMapEventArgs e)
        {
            SimpleMarkerOverlay markerOverlay = (SimpleMarkerOverlay)winformsMap1.Overlays["MarkerOverlay"];

            Marker marker = new Marker(e.WorldLocation);
            marker.Image = RotateImage(Properties.Resources.AQUA,30);
            //marker.Image = Properties.Resources.AQUA;
            //marker.Width = 20;
            //marker.Height = 34;
            marker.YOffset = -17;

            markerOverlay.Markers.Add(marker);

            winformsMap1.Refresh();
        }

        public static System.Drawing.Image RotateImage(System.Drawing.Image img, float rotationAngle)
        {
            //TODO: we can do more, actually, it is not a square image after the rotation.
            double newWidth = Math.Ceiling(Math.Sqrt(Math.Pow(img.Width, 2) + Math.Pow(img.Height, 2)));

            //create an empty Bitmap image
            Bitmap bmp = new Bitmap((int)newWidth, (int)newWidth);

            //turn the Bitmap into a Graphics object
            Graphics gfx = Graphics.FromImage(bmp);

            //now we set the rotation point to the center of our image
            gfx.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2);

            //now rotate the image
            gfx.RotateTransform(rotationAngle);

            //set the InterpolationMode to HighQualityBicubic so to ensure a high
            //quality image once it is transformed to the specified size
            gfx.InterpolationMode = InterpolationMode.HighQualityBilinear;

            //now draw our new image onto the graphics object
            gfx.DrawImageUnscaled(img, new Point((int)(-img.Width * 0.5), (int)(-img.Height * 0.5)));

            gfx.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2);

            //dispose of our Graphics object
            gfx.Dispose();

            //return the image
            return bmp;
        }