private void SetBackgroundGrid()
{
// just need a tiny tile image
Image tile = new Bitmap(16, 16);
using (Graphics g = Graphics.FromImage(tile))
{
g.DrawLine(Pens.Gray, 15, 0, 15, 15);
g.DrawLine(Pens.Gray, 0, 15, 15, 15);
}
this.BackgroundImage = tile;
this.BackgroundImageLayout = ImageLayout.Tile;
}