Simple:
* I was delighted to hear the good news.
* She was delighted with her birthday present.
More complex:
* The children were delighted by the magician's tricks.
* The author was delighted by the positive reviews of her new book.
* The team was delighted to win the championship.
* We were delighted to receive your invitation.
* I was delighted to see you at the party.
Formal:
* The organizers were delighted with the success of the event.
* The company was delighted to announce the promotion of its CEO.
Informal:
* I'm delighted to meet you!
* I was delighted to get a hug from my best friend.
The best way to use "delighted" will depend on the context and the tone you are trying to convey.