1. **What is state management in ASP.NET?**
State management refers to the techniques used to retain the state of controls and data between multiple requests in ASP.NET applications.
2. **What are the different state management techniques available in ASP.NET?**
The different state management techniques in ASP.NET include ViewState, Session state, Application state, Cookies, QueryString parameters, and Control state.
3. **Explain Session state in ASP.NET.**
Session state is used to store user-specific data throughout multiple requests within the same session. It is stored on the server and is unique to each user session.
4. **How is Session state maintained in ASP.NET?**
Session state can be maintained using either in-process session state, state server session state, or SQL Server session state, depending on the configuration in the web.config file.
5. **What is the default mode of Session state in ASP.NET?**
The default mode of Session state in ASP.NET is "InProc," where session data is stored in the application's process memory.
6. **What are the advantages of using Session state?**
Session state allows storing user-specific data securely on the server, provides data persistence across multiple requests, and is accessible from different pages within the same session.
7. **What are the limitations of Session state?**
Limitations of Session state include increased server memory usage, scalability issues in web farms or web gardens, and potential session timeout issues.
8. **How do you access Session state in ASP.NET?**
Session state can be accessed using the HttpSessionState object or through the HttpContext.Current.Session property in ASP.NET code-behind or ASP.NET MVC controllers.
9. **Explain how to enable Session state in ASP.NET.**
Session state is enabled by default in ASP.NET. However, you can configure it in the web.config file by setting the `<sessionState>` element's mode attribute to "InProc," "StateServer," or "SQLServer."
10. **What is a session ID, and how is it used in Session state?**
A session ID is a unique identifier assigned to each user session. It is stored as a cookie or appended to the URL and is used to associate subsequent requests with the correct session data on the server.