How can you obtain a list of the sheets in your document?
To obtain the list of sheets, use the ViewSheet class in the FilteredElementCollector.
The ViewSheet class in the Revit API facilitates the creation and management of sheets containing views and title blocks.
Why are we using "Cast<ViewSheet>()"?
Cast is used to convert the elements in the collection from their base Element type to the specific ViewSheet type
To work with these elements specifically as ViewSheet objects (which have properties and methods specific to ViewSheet), you need to cast them from the base Element type to the ViewSheet type
