ASP.Net MVC- How to change master page for a view at runtime?

You can pass the master page name when you return the ViewResult from the Controller's Action.

For e.g, this would return the ViewResult with a new master page name.

public ActionResult TestToChangeMasterPage()
{
            var view = View();
            view.MasterName = "newMasterPageName";
            return view;
}