The Dutch speak directly and use ample eye contact.
In the Netherlands, when someone is introduced to you, he/she will shake hands with you and state his/her name. Upon leaving, you shake hands again and thank the person in question for the visit /meeting.
The Dutch do not use titles when they talk to people. In writing, you can state a title, but this is only done in official letters.
If it is your birthday your colleagues or classmates expect you to bring your own cake or other treat to share.