For Dutch citizen. What are the consequences for my Dutch nationality?
If you acquired another nationality voluntarily before 1 April 2003, you automatically lost your Dutch nationality.
However, if you voluntarily acquired another nationality on or after 1 April 2003, under the amended Act you still lost your Dutch nationality, but the following exceptions apply since that date.
After 1 April 2003, Dutch citizens with dual nationality may lose their Dutch nationality if they reside outside the Kingdom of the Netherlands or outside the European Union for a long period. Their place of birth is irrelevant in this event.
If you hold the same foreign nationality alongside Dutch nationality for ten years, and you are resident outside the Kingdom of the Netherlands and the European Union for ten years, you will lose your Dutch nationality.
You can ensure that you retain your Dutch nationality by having your principal residence in the Kingdom of the Netherlands or the European Union for at least one year or applying for a Dutch passport or proof of Dutch nationality before 1 April 2013. A new ten-year period starts on the day you are issued with a passport or proof of Dutch nationality.
You will not lose your Dutch nationality:
a) if you were born in the country of your other nationality and have your principal residence there when you acquire the nationality of that country;
b) if, before you turned 18, you had your principal residence in the country of your other nationality for an uninterrupted period of five years;
c) if you are married to a person who possesses the nationality you wish to acquire.
Ministerie van Buitenlandse Zaken
anyway,it's still not that simple, some exceptions exist, you should refer to: