Different types of session management in asp.net

                Session object is mainly used to store the data and pass it from one page to another page in your applications.
syntax to use sessions

session["username"]=txtusername.Text;
To retrive the value in the session:

string username=convert.tostring(session["username"]);

 
U can store a single variable or objects like dataset,datatable, array etc also in the sessions.
Once u close u r application, u r session data will be lost.
u have following types of session management in asp.net which u can define in your web.config file

 
session mode="inproc"...means the session will be stored on the webserver within u r application
session mode="outproc"....means session will be stored on the server outside u r application
session mode="stateserver"...means session will be stored in a temporary memory in the database
session mode="sqlserver"...means session will be stored in the databsae permanently.