Comments by TopCatMx (Top 1 by date)

Reason for my vote of 5 \n This example code of dropdown controls in MVC is perfect because:

Resets controls when choosing an option.
Do not refresh entire page, hence use Ajax.
Use Action to render controls.
Perfect balance between client and server code.
Avoid use of ViewBag, ViewData etc!.
Clever use of ViewModels.