HTTP is stateless protocol which means that server treats each request independently, session enables the user to save and retrieve values while user navigates the web app.
The collection of session variables is indexed by the name of the variable or by an integer index. Session variables are created by referring to the session variable by name. You do not have to declare a session variable or explicitly add it to the collection. The following example shows how to create session variables in an ASP.NET page for the first and last name of a user, and set them to values retrieved from TextBox controls.
Session["FirstName"] = FirstNameTextBox.Text;
Session["LastName"] = LastNameTextBox.Text;
Session variables can be any valid .NET Framework type. The following example stores an ArrayList object in a session variable named StockPicks. The value returned by the StockPicks session variable must be cast to the appropriate type when you retrieve it from the SessionStateItemCollection.
// When retrieving an object from session state, cast it to
// the appropriate type.
ArrayList stockPicks = (ArrayList)Session["StockPicks"];
// Write the modified stock picks list back to session state.
Session["StockPicks"] = stockPicks;
Sessions are identified by a unique identifier that can be read by using the SessionID property. When session state is enabled for an ASP.NET application, each request for a page in the application is examined for a SessionID value sent from the browser. If no SessionID value is supplied, ASP.NET starts a new session and the SessionID value for that session is sent to the browser with the response.
By default, SessionID values are stored in a cookie. However, you can also configure the application to store SessionID values in the URL for a "cookieless" session.
A session is considered active as long as requests continue to be made with the same SessionID value. If the time between requests for a particular session exceeds the specified time-out value in minutes, the session is considered expired. Requests made with an expired SessionID value result in a new session.
The text above is taken from Microsoft.
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Save Values in Session State
This example uses the HttpSessionState object to persist values within an individual session.
string firstName = "Jeff";
string lastName = "Smith";
string city = "Seattle";
Session["FirstName"] = firstName;
Session["LastName"] = lastName;
Session["City"] = city;
The text above is taken from Microsoft.
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Read Values from Session State
This example accesses the Item property to retrieve the values in session state.
string firstName = (string)(Session["First"]);
string lastName = (string)(Session["Last"]);
string city = (string)(Session["City"]);
The text above is taken from Microsoft.
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State management is an art which retains user specific
info between requests but most of the time the scope of info is global to
entire app, To achieve the goal of state management in the app you may mix up
the following server side state management options
- Database support
