The basis of the stroke is to go on one knee to a good length or slightly short of length delivery off a fast or medium paced bowler and 'scoop' the ball over the head of the wicket keeper. The ball travels straight towards the boundary behind the wicket keeper.
There has been much discussion whether the Dilscoop is identical to the Marillier or Paddle scoop. However according to former Australian captain Ian Chappell who was commentating during the above ICC World Twenty20, he had never seen any batsman play the ball straight over the wicket keeper's head as Dilshan does since Marillier played it in the ICC World Cup vs Glenn McGrath.
While the Dilscoop travels straight over the wicket keeper, the Marilier travels towards fine leg, deep fine leg or over the wicket keeper and slips, and the paddle scoop preferred by many players including Moin Khan, Misbah-ul-Haq and Steve Waugh among others is played against a yorker.
The "Dilscoop" shot was played much earlier, by then Somerset captain Brian Langford, in an English county match at the Edgarley ground in Glastonbury in 1962. It probably escaped the headlines because Langford, as primarily a spin bowler, batted well down the order - usually at 9.
Former Australian wicket keeper Ryan Campbell also played this shot twice in the dying overs of a one-day match against Sri Lanka in 2002. Given Campbell's one-day international career lasted only two matches, it is perhaps introducing the Australian cricketing public to this shot that is his greatest claim to fame.