<s>
ASP.NET	B-Language
MVC	I-Language
is	O
a	O
web	B-Application
application	I-Application
framework	I-Application
developed	O
by	O
Microsoft	O
that	O
implements	O
the	O
model	O
–	O
view	O
–	O
controller	O
(	O
MVC	O
)	O
pattern	O
.	O
</s>
<s>
It	O
is	O
open-source	B-Application
software	I-Application
,	O
apart	O
from	O
the	O
ASP.NET	B-Application
Web	B-Application
Forms	I-Application
component	O
,	O
which	O
is	O
proprietary	B-Application
.	O
</s>
<s>
ASP.NET	B-Application
Core	I-Application
has	O
since	O
been	O
released	O
,	O
which	O
unified	O
ASP.NET	B-Application
,	O
ASP.NET	B-Language
MVC	I-Language
,	O
ASP.NET	B-Language
Web	I-Language
API	I-Language
,	O
and	O
ASP.NET	B-Application
Web	I-Application
Pages	I-Application
(	O
a	O
platform	O
using	O
only	O
Razor	B-Application
pages	O
)	O
.	O
</s>
<s>
Core	O
is	O
currently	O
planned	O
to	O
merge	O
into	O
"	O
.NET	B-Application
5	O
"	O
.	O
</s>
<s>
Some	O
well	O
known	O
sites	O
that	O
use	O
ASP.NET	B-Language
MVC	I-Language
include	O
Stack	B-Error_Name
Overflow	I-Error_Name
,	O
Microsoft	O
,	O
GoDaddy	O
and	O
Ancestry.com	O
.	O
</s>
<s>
Based	O
on	O
ASP.NET	B-Application
,	O
ASP.NET	B-Language
MVC	I-Language
allows	O
software	O
developers	O
to	O
build	O
a	O
web	B-Application
application	I-Application
as	O
a	O
composition	O
of	O
three	O
roles	O
:	O
Model	O
,	O
View	O
and	O
Controller	O
.	O
</s>
<s>
The	O
MVC	O
model	O
defines	O
web	B-Application
applications	I-Application
with	O
3	O
logic	O
layers	O
:	O
</s>
<s>
A	O
view	O
accepts	O
necessary	O
information	O
from	O
the	O
controller	O
and	O
renders	O
a	O
user	O
interface	B-Application
to	O
display	O
that	O
information	O
.	O
</s>
<s>
In	O
April	O
2009	O
,	O
the	O
ASP.NET	B-Language
MVC	I-Language
source	O
code	O
was	O
released	O
under	O
the	O
Microsoft	B-License
Public	I-License
License	I-License
(	O
MS-PL	O
)	O
.	O
</s>
<s>
"	O
ASP.NET	B-Language
MVC	I-Language
framework	I-Language
is	O
a	O
lightweight	O
,	O
highly	O
testable	O
presentation	O
framework	O
that	O
is	O
integrated	O
with	O
existing	O
ASP.NET	B-Application
features	O
.	O
</s>
<s>
The	O
ASP.NET	B-Language
MVC	I-Language
framework	I-Language
couples	O
the	O
models	O
,	O
views	O
,	O
and	O
controllers	O
using	O
interface-based	O
contracts	O
,	O
thereby	O
allowing	O
each	O
component	O
to	O
be	O
tested	O
independently	O
.	O
</s>
<s>
In	O
March	O
2012	O
,	O
Scott	O
Guthrie	O
announced	O
on	O
his	O
blog	O
that	O
Microsoft	O
had	O
released	O
part	O
of	O
its	O
web	O
stack	O
(	O
including	O
ASP.NET	B-Language
MVC	I-Language
,	O
Razor	B-Application
and	O
Web	O
API	O
)	O
under	O
an	O
open	O
source	O
license	O
(	O
Apache	B-Application
License	I-Application
2.0	I-Application
)	O
.	O
</s>
<s>
The	O
source	O
code	O
now	O
resides	O
on	O
CodePlex	B-Protocol
.	O
</s>
<s>
ASP.NET	B-Application
Web	B-Application
Forms	I-Application
was	O
not	O
included	O
in	O
this	O
initiative	O
for	O
various	O
reasons	O
.	O
</s>
<s>
The	O
view	O
engines	O
used	O
in	O
the	O
ASP.NET	B-Language
MVC	I-Language
3	O
and	O
MVC	O
4	O
frameworks	O
are	O
Razor	B-Application
and	O
the	O
Web	B-Application
Forms	I-Application
.	O
</s>
<s>
By	O
default	O
,	O
the	O
view	O
engine	O
in	O
the	O
MVC	O
framework	O
uses	O
Razor	B-Application
.cshtml	O
and	O
.vbhtml	O
,	O
or	O
Web	B-Application
Forms	I-Application
.aspx	B-Application
pages	O
to	O
design	O
the	O
layout	O
of	O
the	O
user	O
interface	B-Application
pages	O
onto	O
which	O
the	O
data	O
is	O
composed	O
.	O
</s>
<s>
Additionally	O
,	O
rather	O
than	O
the	O
default	O
ASP.NET	B-Application
Web	B-Application
Forms	I-Application
postback	O
model	O
,	O
any	O
interactions	O
are	O
routed	O
to	O
the	O
controllers	O
using	O
the	O
ASP.NET	B-Application
Routing	O
mechanism	O
.	O
</s>
<s>
The	O
StringTemplate	O
View	O
Engine	O
utilizes	O
a	O
.NET	B-Application
port	O
of	O
the	O
Java	O
templating	O
engine	O
,	O
StringTemplate	O
.	O
</s>
<s>
Spark	O
is	O
a	O
view	O
engine	O
for	O
the	O
ASP.NET	B-Language
MVC	I-Language
(	O
and	O
the	O
Castle	O
Project	O
MonoRail	O
)	O
frameworks	O
.	O
</s>
<s>
NDjango	O
is	O
a	O
port	O
of	O
the	O
Django	B-Language
web	I-Language
framework	I-Language
's	O
templating	O
language	O
to	O
.NET	B-Application
.	O
</s>
<s>
Naked	B-Application
Objects	I-Application
for	I-Application
.NET	I-Application
is	O
an	O
implementation	O
of	O
the	O
naked	B-Architecture
objects	I-Architecture
pattern	O
using	O
ASP.NET	B-Language
MVC	I-Language
.	O
</s>
