Peel an oinion, cut in four pieces, place each piece in your Lawn to dig 2/3 inches each 3 yards apart along the borders of your Lawn.
For a bigger Lawn, place diagonal as well. By the time you have a cup of tea, the ants have disappeared.
Hey Mr Shah, its good to know that GardensOnline reaches gardeners around the world. A warm welcome to all from Pakistan.