- Views are the part of MVC which is supposed to contain presentation logic.
- Model layer is where business logic is contained.
- Controllers only change the state of both, based on user input.
So the choice is - do you think that this is part of the domain business logic or presentation logic.
If you were implementing a proper MVC Model2 or classical MVC pattern, then I would say that the ordering of data provided by the model layer should be triggered by the view's request to the model layer. View asks for ordered data, model layer provides it.
But, since you are using ASP.NET MVC's interpretation of MVC pattern, which is a bit different then your standard MVC - the ViewModel instance should request ordered information from the model layer (for some reason ASP.NET framework thinks that templates should be called "views" and views should be called "viewmodels" .. it's strange).
