ASP.NET pages typically post back to themselves in order to 
process events.

Cross Page posting enables us to submit a form and have 
this form and all its control values posted to another page.
The control which posts the page and all the control values 
it contains has PostbackURL property.

And the receiving page uses PreviousPage property and the 
PreviousPageType page directive to access the posting page 
values

three types of session states in asp.net

InProc
OutProc
SqlServer

As mentioned by manumathi.There are three session states:
inproc
sqlserver
stateserver

There are four types of session state in asp.net 2.0
1. In proc session
2. Out Proc session
3.Web Farm
4. Web Garden

Three types of Sessions are in .Net
1. In Proc
2. Out Proc
3. State Server/ Sql Server

In proc does not support Web Farming &b Web Gardening while 
the other 2 supports.

I dont know why people are saying Web Garden & Web Farming 
are the types of session for eg. Prem

Three Types of Session 

i) inprocess session
II)out Process session
III) SQl-server session

Inprocess session by default in web.cofig File.
out process is stored at server side.
sql-server session is stored in Database(sql).

sabeer pasha.

Three types of session states in asp.net:-
1. Sql Server
2. Inprocess session
3. Out Process session

There are three types of sessions in asp.net:
1.In-process(Default).
2.windows Service(out-proc)
3.SQL server

There are three types of session in asp.net 2.0
1.Inproc(In Local process and default one)
2.Stateserver(At differnt Process and need serialised data)
3.Sqlserver(At sql Server and need serialised data)

The latter two are good for working with web farms and web 
gardens.

1.In Proc (bydefault, highest performance)
2. out Proc/state server(differe dedicated server)
3. SQL server(Reside in mssql databse)

sessions are two types :
they are 
1.Inprocess(this is default,and high performence)
2:outprocess
in out proc we have other two types of sessions
they are 
     *state server
     *sql server
these out proc is useful whethr the infrmation is 
maintained in between to servers that time only we can use 
this sessions.

two Types:
(1) Session InProc:
        INProc
(2) session OutProc:
      State Server 
      Sql Server

There are two main categories of session in asp.net2.0,
(1) Session InProcess:
        InProc
(This is default in web.cofig file and high performence.)

(2) Session OutProcess:
      State Server 
      Sql Server
(These out proc is useful whethr the infrmation is 
maintained in between to servers that time only we can use 
this sessions.)

Simply three types of session in asp.net2.0,
i)InProc
ii)State Server
iii)SQL Server


Regards,
 Nizath Ali.U

3 types

In proc
Out proc
Sql server

2 Types of Session
1>Inproc
2>Outproc

Basically there r 4 types of session these r:-

(a)InProc
(b)State server
(c)Sql Server
(d)Custom provider
(e)OutProc

Two types of sessions are there : 
a. In process
b. Out Process

in which
 
a. In Process includes State Server/Cookies type of session 
management.

b. Out Process includes SQL Server's type of session 
management.