I have a problem to decide whether to use a view or a temp table.
I have a stored procedure that i call from program. In that SP i store the result of a long query i
It is really a situational and operation specific question and answer may vary depending on the requirements of the scenario. However, a small point that i would like to add is that if you are using a view to store results of a complex query, which are in turn used in operations of a GridView, then it can be troublesome to perform update operations on complex views. On the contrary, Temp Tables can suffice to this perfectly.
Again, There are scenario's where Views may be a better choice [ as in Multiple Database Servers if not handled properly] but it depends on what you want to do.