<s>
ASP.NET	B-Application
AJAX	I-Application
,	O
formerly	O
called	O
Atlas	B-Application
,	O
is	O
a	O
set	O
of	O
extensions	O
to	O
ASP.NET	B-Application
developed	O
by	O
Microsoft	O
for	O
implementing	O
Ajax	B-General_Concept
functionality	O
.	O
</s>
<s>
It	O
is	O
released	O
under	O
the	O
Microsoft	B-License
Public	I-License
License	I-License
(	O
Ms-PL	O
)	O
.	O
</s>
<s>
ASP.NET	B-Application
AJAX	I-Application
runs	O
on	O
the	O
following	O
browsers	O
:	O
</s>
<s>
At	O
present	O
,	O
the	O
ASP.NET	B-Application
AJAX	I-Application
suite	O
consists	O
of	O
the	O
following	O
components	O
and	O
packages	O
:	O
</s>
<s>
Microsoft	O
Now	O
Launched	O
Ajax	B-General_Concept
Library	O
4.0	O
,	O
which	O
supports	O
Data	O
Driven	O
Web	O
Applications	O
.	O
</s>
<s>
Microsoft	B-Application
Ajax	I-Application
Library	I-Application
3.5	O
,	O
which	O
is	O
a	O
JavaScript	O
library	O
that	O
provides	O
the	O
client-side	O
features	O
of	O
the	O
ASP.NET	B-Application
AJAX	I-Application
framework	O
.	O
</s>
<s>
Integrated	O
in	O
ASP.NET	B-Application
3.5	O
,	O
the	O
library	O
is	O
also	O
available	O
as	O
a	O
separate	O
download	O
for	O
use	O
in	O
other	O
environments	O
,	O
such	O
as	O
PHP	B-Application
.	O
</s>
<s>
A	O
server	O
framework	O
–	O
included	O
in	O
ASP.NET	B-Application
3.5	O
–	O
for	O
building	O
Ajax-enabled	O
ASP.NET	B-Application
server	O
controls	O
.	O
</s>
<s>
These	O
components	O
are	O
also	O
available	O
for	O
ASP.NET	B-Application
2.0	I-Application
in	O
a	O
separate	O
package	O
called	O
ASP.NET	B-Application
AJAX	I-Application
1.0	O
Extensions	O
.	O
</s>
<s>
ASP.NET	B-Application
2.0	I-Application
AJAX	B-General_Concept
Templates	O
,	O
a	O
package	O
with	O
a	O
set	O
of	O
Visual	O
Studio	O
templates	O
for	O
building	O
ASP.NET	B-Application
AJAX	I-Application
applications	O
with	O
ASP.NET	B-Application
2.0	I-Application
and	O
Visual	O
Studio	O
2008	O
.	O
</s>
<s>
ASP.NET	B-Application
AJAX	I-Application
Preview	O
,	O
a	O
package	O
with	O
the	O
new	O
features	O
that	O
will	O
be	O
part	O
of	O
the	O
future	O
versions	O
of	O
the	O
framework	O
.	O
</s>
<s>
The	O
Microsoft	B-Application
Ajax	I-Application
Library	I-Application
is	O
a	O
JavaScript	O
library	O
that	O
provides	O
the	O
features	O
for	O
the	O
client	O
portion	O
of	O
the	O
ASP.NET	B-Application
AJAX	I-Application
framework	O
.	O
</s>
<s>
Ajax	B-General_Concept
–	O
A	O
set	O
of	O
client	O
components	O
is	O
provided	O
to	O
handle	O
Ajax	B-General_Concept
requests	O
and	O
web-service	O
calls	O
.	O
</s>
<s>
Application	O
Services	O
–	O
The	O
library	O
allows	O
accessing	O
the	O
ASP.NET	B-Application
Membership	O
,	O
Authentication	O
,	O
Roles	O
and	O
Profile	O
services	O
from	O
the	O
client	O
side	O
.	O
</s>
<s>
Recently	O
,	O
new	O
features	O
have	O
been	O
announced	O
as	O
part	O
of	O
the	O
ASP.NET	B-Application
AJAX	I-Application
4.0	O
release	O
:	O
</s>
<s>
The	O
UpdatePanel	O
is	O
an	O
ASP.NET	B-Application
server	O
control	O
that	O
updates	O
portions	O
of	O
a	O
web	O
page	O
without	O
reloading	O
it	O
.	O
</s>
<s>
Through	O
a	O
mechanism	O
called	O
asynchronous	O
postback	B-Application
,	O
the	O
HTML	O
for	O
the	O
region	O
of	O
the	O
page	O
wrapped	O
by	O
the	O
control	O
is	O
sent	O
by	O
the	O
server	O
asynchronously	O
through	O
an	O
Ajax	B-General_Concept
request	O
.	O
</s>
<s>
The	O
ASP.NET	B-Application
controls	O
that	O
have	O
been	O
specified	O
as	O
content	O
in	O
an	O
UpdatePanel	O
are	O
able	O
to	O
cause	O
either	O
synchronous	O
(	O
traditional	O
)	O
or	O
asynchronous	O
postbacks	B-Application
,	O
by	O
means	O
of	O
triggers	O
.	O
</s>
<s>
A	O
trigger	O
is	O
an	O
event	O
coming	O
from	O
an	O
ASP.NET	B-Application
control	O
that	O
causes	O
an	O
UpdatePanel	O
to	O
refresh	O
its	O
contents	O
.	O
</s>
<s>
Through	O
triggers	O
,	O
an	O
asynchronous	O
postback	B-Application
can	O
be	O
started	O
also	O
by	O
controls	O
that	O
are	O
declared	O
outside	O
the	O
region	O
of	O
the	O
ASP.NET	B-Application
page	O
wrapped	O
by	O
the	O
UpdatePanel	O
control	O
.	O
</s>
<s>
ASP.NET	B-Application
AJAX	I-Application
framework	O
brings	O
JSONserialization	O
features	O
to	O
the	O
ASP.NET	B-Application
web-services	O
and	O
allows	O
calling	O
web-services	O
from	O
client-side	O
JavaScript	O
,	O
even	O
using	O
third-party	O
JavaScript-libraries	O
like	O
jQuery	B-Language
.	O
</s>
