private void button4_Click(object sender, EventArgs e)
{
if (gMapControl.Zoom > 10)
gMapControl.Position = new PointLatLng(gMapControl.Position.Lat, gMapControl.Position.Lng + 0.1);
if (gMapControl.Zoom > 8)
gMapControl.Position = new PointLatLng(gMapControl.Position.Lat, gMapControl.Position.Lng + 0.2);
else
gMapControl.Position = new PointLatLng(gMapControl.Position.Lat, gMapControl.Position.Lng + 0.5);
UpdatelblCenter();
}