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ASP.NET Session State

ASP.NET session state enables you to store and retrieve values for a user as the user navigates the different ASP.NET pages that make up a Web application. HTTP is a stateless protocol, meaning that your Web server treats each HTTP request for a page as an independent request; by default, the server retains no knowledge of variable values used during previous requests. As a result, building Web applications that need to maintain some cross-request state information (applications that implement shopping carts, data scrolling, and so on) can be a challenge. ASP.NET session state identifies requests received from the same browser during a limited period of time as a session, and provides the ability to persist variable values for the duration of that session.

ASP.NET session state is enabled by default for all ASP.NET applications. ASP.NET session-state variables are easily set and retrieved using the Session property, which stores session variable values as a collection indexed by name. For example, the following code example creates the session variables FirstName and LastName to represent the first name and last name of a user, and sets them to values retrieved from TextBox controls.

Session["FirstName"] = FirstNameTextBox.Text;
Session["LastName"] = LastNameTextBox.Text;

ASP.NET stores session information in the memory space of the ASP.NET application by default. You can, optionally, store session information using a stand-alone service so that session information is preserved if the ASP.NET application is restarted, in a SQL Server so that session information is available to multiple Web servers in a Web farm (and also persists if the ASP.NET application is restarted), or in a custom data store. For more information, see Session-State Modes.

ASP.NET also provides several other options for persisting data within an application besides session state. For a comparison of each, see ASP.NET State Management Recommendations.

In This Section

Session State Overview

Describes the different capabilities of the session-state feature.

Session Identifiers

Describes how a browser is identified with a particular session.

Session-State Events

Describes session-state events that can be added to the global.asax file.

Session-State Modes

Discusses the different session-state storage modes.

Securing Session State

Describes security issues to consider when using session state.

How to: Save Values in Session State

Provides a sample of storing values in session-state variables.

How to: Read Values from Session State

Provides a sample of reading values from session-state variables.

Implementing a Session-State Store Provider

Describes how to create a custom session-state store provider and includes a sample.

Reference

System.Web.SessionState

Provides classes and interfaces that enable storage of application data in session state.

Session

Provides access to the session for the current HTTP request.

Related Sections

ASP.NET State Management Recommendations

Describes differences between ASP.NET state-management options.

ASP.NET State Management

Provides an overview of the methods available to store application state in ASP.NET applications.

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