My method for grilling corn is the easiest ever, and the only way I cook corn on the cob. Toss the husks directly on hot grill grates, cover, and let them steam.
To grill corn, simply place it on a hot grill. I suggest keeping the corn in its husks to steam as it cooks. Close the grill, checking and turning with tongs, every five minutes or so, for around 15-20 minutes.
Remove the husks (if you haven't already) and slather with your choice of flavored butters or plain, salted butter. If you prefer a smokier charred corn on the cob, simply add back to the grill after husking for just a little more char.
Don't have a grill? You can still achieve a nice charred flavor by using a cast iron grill pan or skillet. For this method, you will need to husk your corn. Put a little oil or butter in a skillet and get it hot. Place your corn in the skillet and turn every few minutes, getting a nice sear on all sides.