ASP.NET Session State and Application State Interview Questions

Q : What is a Session?

Ans : A Session is a unique instance of the browser. A single user can have multiple instances of the browser running on his or her machine. If each instance visits your Web application, each instance has a unique session.A session starts when a user accesses a page on a Web site for the first time, at which time they are assigned a unique session ID. The server stores the user's session ID in the Session.SessionID property.

Q : What is the default session timeout period?

Ans : 20 minutes.

Q : Where do you generally specify the Session Timeout?

Ans : You specify the Session Timeout setting in the web.config file.

Q : Can you specify Session Timeout in a code behind file?

Ans : Yes, can specify the Session.Timeout property as shown below in a code behind file. Session.Timeout = 10;

Q : How do you end a user session?

Ans : You can call the Session.Abandon() method to end a user session. If a user then tries to access a page the server will assign them a new session ID and it will clear all the previous session variables. You'll typically use Session.Abandon() on log-out pages.

Q : What type of data can you store in Application State and Session State variables?

Ans : Application State and Session State variables are used to store data that you want to keep for the lifetime of an application or for the lifetime of a session. You can store any type of data in the Application or Session state, including objects.

Q : Are Application State or Session State variables type safe?

Ans : No, Application and Session state variables are created on the fly, without variable name or type checking.

Q : Do maintaining Session state affects performance?

Ans : Yes

Q : Can you turn of Session state?

Ans : Yes, Session state can be turned off at the application and page levels.

Q : Are Application state variables available throughout the current process?

Ans : Yes, Application state variables are available throughout the current process, but not across processes. If an application is scaled to run on multiple servers or on multiple processors within a server, each process has its own Application state.

Q : How do you disable Session state for a Web form?

Ans : To turn Session state off for a Web form set EnableSessionState property of the Page to False.

Q : How do you turn Session state off for an entire web application?

Ans : In the Web.config file, set the sessionstate tag to False.

Q : What are Application State variables?

Ans : Application State variables are global variables that are available from anywhere in the application. All Sessions can access Application State variables.

Q : How to add and remove data to Application State Variables?

Ans ://Code to add data to Application State
Application.Add("AppName", "Sample");

//Code to remove data from Application State
Application.Remove("A ppName");

Q : How do you remove all Application State Variables data?

Ans : //Code to remove all Application State Variables data
Application.RemoveAll();

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