Shuck the corn real good getting the extra silks off by using a paper towel or a small tooth brush.  Wash the corn and drop in boiling water just long enough to heat through.  Then take the corn and plunge in a sink or large container of Ice Water.  The secret is cooling it as soon as possible.  Drain and put in bags.  I once had such a huge amount of corn, I scrubbed the bath tub, bought extra ice and cooled it down in it. You can't go wrong with this and it is delicious