C#

private Point hotSpot = new Point(50, 50);
private Point lastSnap = new Point(-100, -100);
private void myPictureBox_MouseMove(object sender, MouseEventArgs e)
    {
    PictureBox pb = sender as PictureBox;
    if (pb != null)
        {
        Point p = e.Location;
        int nearX = Math.Abs(p.X - hotSpot.X);
        int nearY = Math.Abs(p.Y - hotSpot.Y);
        if (nearX <= 10 && nearY <= 10)
            {
            if (lastSnap != hotSpot)
                {
                lastSnap = hotSpot;
                Cursor.Position = pb.PointToScreen(hotSpot);
                }
            }
        else
            {
            lastSnap = new Point(-100, -100);
            }
        }
    }

class MyWebClient : WebClient
{
    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address);
        var http = request as HttpWebRequest;
        if (http != null) http.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
        return request;
    }
}
...
using (var webClient = new MyWebClient())
{
    ...
}