Answer / rame

MVC3 supports Json

Answer / nagaganesh

MVC 2:

Client-side Validation
Asynchronous controllers

MVC 3:

Unobtrusive client-side validation and jQuery support
JSON model binding

Answer / jacintha

ASP.NET MVC 3 is compatible with ASP.NET MVC 2 – which
means it will be easy to update projects you are writing
with MVC 2 to MVC 3 when it finally releases. The new
features in MVC 3 build on top of the foundational work
we’ve already done with the MVC 1 and MVC 2 releases –
which means that the skills, knowledge, libraries, and
books you’ve acquired are all directly applicable with the
MVC 3 release. MVC 3 adds new features and capabilities –
it doesn’t obsolete existing ones.

Answer / aimbin

To know the difference among mvc2,mvc3 and mvc4 plz visit following link

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