Agreed. SPA is one option that I should have included. jQueryUI and Wijmo make things much easier.

>Before you make a decision on this., be sure to watch the entire John Papa course at Pluralsight on SPA ( single page HTML5 applications that use Ajax calls to modify a main page interface.) As to UI, the jqueryUI and related libaries coupled with knockout.js for binding make some many things that used to be such an agony so easy I have to believe this is the wave of the future, certainly for web apps and for desktop as intranet.
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>Trust me it is worth your time to spend some time with this stuff before you invest any time in webforms etc. Don't even think about developing a UI framework until you know what jquery-ui, the related grid controls, and Wijmo can do right out of the box with HTML5