private void frmMain_Load(object sender, EventArgs e)
    {
     
      wfMap.MapUnit = GeographyUnit.DecimalDegree;
      AddRasterLayer();
    }

    void AddRasterLayer()
    {
      GdiPlusRasterLayer gdiPlusRasterLayer = new GdiPlusRasterLayer();
      gdiPlusRasterLayer.StreamLoading += new EventHandler<StreamLoadingEventArgs>(a_StreamLoading);
      LayerOverlay ov = new LayerOverlay();
      ov.Layers.Add(gdiPlusRasterLayer);
      wfMap.Overlays.Add(ov);
      wfMap.Refresh();
    }

    void a_StreamLoading(object sender, StreamLoadingEventArgs e)
    {
      if (e.StreamType == "Image File")
      {
        Bitmap bitmap = new Bitmap(@"World.tif");
        bitmap.RotateFlip(RotateFlipType.Rotate90FlipNone);
        MemoryStream memoryStream = new MemoryStream();
        bitmap.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Tiff);
        e.AlternateStream = memoryStream;
      }

      if (e.StreamType == "World File")
      {
        Stream stream = new FileStream(@"World.tfw", FileMode.Open, FileAccess.Read);
        e.AlternateStream = stream;
      }
    }