I have been a frequent visitor to The Netherlands and other Schengen states (for both business and tourism purposes) in past several years and had many visas issued previously.
The current visa I have is a 5-year validity (valid until 2020) Schengen Type C multiple entry visa issued by the Embassy of The Netherlands. The purpose I have indicated when I applied for this visa was "tourism" in The Netherlands and other Schengen states. I have already used this visa for tourism to The Netherlands and Italy for 8 days last year 2015.
Next month (April 2016), I will be travelling to Norway on business for 5 days. I already have the invitation letter from the host company in Norway. I also believe that I will be required for another business trip to The Netherlands in May 2016.
My two questions which I need your help in are:
Can I use the Schengen visa I have now (ie. issued for tourism) to go to Norway on business?
Can I use the same visa for other business visits within Schengen states?