<s>
ADO.NET	B-Device
is	O
a	O
data	B-General_Concept
access	I-General_Concept
technology	O
from	O
the	O
Microsoft	B-Application
.NET	I-Application
Framework	I-Application
that	O
provides	O
communication	O
between	O
relational	O
and	O
non-relational	O
systems	O
through	O
a	O
common	O
set	O
of	O
components	O
.	O
</s>
<s>
ADO.NET	B-Device
is	O
a	O
set	O
of	O
computer	O
software	O
components	O
that	O
programmers	O
can	O
use	O
to	O
access	O
data	O
and	O
data	O
services	O
from	O
a	O
database	O
.	O
</s>
<s>
It	O
is	O
a	O
part	O
of	O
the	O
base	O
class	O
library	O
that	O
is	O
included	O
with	O
the	O
Microsoft	B-Application
.NET	I-Application
Framework	I-Application
.	O
</s>
<s>
ADO.NET	B-Device
is	O
sometimes	O
considered	O
an	O
evolution	O
of	O
ActiveX	B-Library
Data	I-Library
Objects	I-Library
(	O
ADO	O
)	O
technology	O
,	O
but	O
was	O
changed	O
so	O
extensively	O
that	O
it	O
can	O
be	O
considered	O
an	O
entirely	O
new	O
product	O
.	O
</s>
<s>
ADO.NET	B-Device
is	O
conceptually	O
divided	O
into	O
consumers	O
and	O
data	O
providers	O
.	O
</s>
<s>
Functionality	O
exists	O
in	O
Visual	B-Application
Studio	I-Application
IDE	O
to	O
create	O
specialized	O
subclasses	O
of	O
the	O
DataSet	O
classes	O
for	O
a	O
particular	O
database	B-Application
schema	I-Application
,	O
allowing	O
convenient	O
access	O
to	O
each	O
field	O
in	O
the	O
schema	B-Application
through	O
strongly	O
typed	O
properties	B-Language
.	O
</s>
<s>
This	O
helps	O
catch	O
more	O
programming	O
errors	O
at	O
compile-time	O
and	O
enhances	O
the	O
IDE	O
's	O
Intellisense	B-Application
feature	O
.	O
</s>
<s>
ADO.NET	B-Device
data	I-Device
providers	I-Device
are	O
analogous	O
to	O
ODBC	O
drivers	O
,	O
JDBC	B-Application
drivers	I-Application
,	O
and	O
OLE	B-Language
DB	I-Language
providers	I-Language
.	O
</s>
<s>
ADO.NET	B-Device
providers	I-Device
can	O
be	O
created	O
to	O
access	O
such	O
simple	O
data	O
stores	O
as	O
a	O
text	O
file	O
and	O
spreadsheet	O
,	O
through	O
to	O
such	O
complex	O
databases	O
as	O
Oracle	B-General_Concept
Database	I-General_Concept
,	O
Microsoft	B-Application
SQL	I-Application
Server	I-Application
,	O
MySQL	B-Application
,	O
PostgreSQL	B-Application
,	O
SQLite	B-Language
,	O
IBM	B-Application
Db2	I-Application
,	O
Sybase	B-Application
ASE	I-Application
,	O
and	O
many	O
others	O
.	O
</s>
<s>
Because	O
different	O
data	O
store	O
technologies	O
can	O
have	O
different	O
capabilities	O
,	O
every	O
ADO.NET	B-Device
provider	I-Device
cannot	O
implement	O
every	O
possible	O
interface	O
available	O
in	O
the	O
ADO.NET	B-Device
standard	O
.	O
</s>
<s>
Entity	O
Framework	O
(	O
EF	O
)	O
is	O
an	O
open	O
source	O
object-relational	O
mapping	O
(	O
ORM	O
)	O
framework	O
for	O
ADO.NET	B-Device
,	O
part	O
of	O
.NET	B-Application
Framework	I-Application
.	O
</s>
<s>
It	O
is	O
a	O
set	O
of	O
technologies	O
in	O
ADO.NET	B-Device
that	O
supports	O
the	O
development	O
of	O
data-oriented	O
software	O
applications	O
.	O
</s>
<s>
The	O
Entity	O
Framework	O
enables	O
developers	O
to	O
work	O
with	O
data	O
in	O
the	O
form	O
of	O
domain-specific	O
objects	O
and	O
properties	B-Language
,	O
such	O
as	O
customers	O
and	O
customer	O
addresses	O
,	O
without	O
having	O
to	O
concern	O
themselves	O
with	O
the	O
underlying	O
database	O
tables	O
and	O
columns	O
where	O
this	O
data	O
is	O
stored	O
.	O
</s>
<s>
LINQ	B-Language
to	O
SQL	O
(	O
formerly	O
called	O
DLINQ	O
)	O
allows	O
LINQ	B-Language
to	O
be	O
used	O
to	O
query	O
Microsoft	B-Application
SQL	I-Application
Server	I-Application
databases	O
,	O
including	O
SQL	O
Server	O
Compact	O
databases	O
.	O
</s>
<s>
Since	O
SQL	O
Server	O
data	O
may	O
reside	O
on	O
a	O
remote	O
server	O
,	O
and	O
because	O
SQL	O
Server	O
has	O
its	O
own	O
query	O
engine	O
,	O
it	O
does	O
not	O
use	O
the	O
query	O
engine	O
of	O
LINQ	B-Language
.	O
</s>
<s>
Instead	O
,	O
the	O
LINQ	B-Language
query	O
is	O
converted	O
to	O
a	O
SQL	O
query	O
that	O
is	O
then	O
sent	O
to	O
SQL	O
Server	O
for	O
processing	O
.	O
</s>
<s>
Since	O
SQL	O
Server	O
stores	O
the	O
data	O
as	O
relational	O
data	O
and	O
LINQ	B-Language
works	O
with	O
data	O
encapsulated	O
in	O
objects	O
,	O
the	O
two	O
representations	O
must	O
be	O
mapped	O
to	O
one	O
another	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
LINQ	B-Language
to	O
SQL	O
also	O
defines	O
a	O
mapping	O
framework	O
.	O
</s>
