11. **How do you manage Session state across multiple servers in a web farm environment?**
In a web farm environment, Session state can be managed using out-of-process modes such as "StateServer" or "SQLServer," where session data is stored centrally and shared across servers.
12. **Explain the difference between Session state and ViewState.**
Session state stores data on the server and is shared across multiple pages within the same session, while ViewState stores data on the client-side and is specific to individual web controls on a page.
13. **What are the security considerations when using Session state?**
Security considerations include protecting session IDs from session hijacking attacks, implementing secure session management practices, and encrypting sensitive session data.
14. **How do you handle session timeout issues in ASP.NET applications?**
Session timeout issues can be handled by adjusting the session timeout value in the web.config file, implementing session timeout handling logic in code-behind, or using client-side JavaScript to refresh the session.
15. **Explain how to store complex objects in Session state.**
Complex objects can be stored in Session state by serializing them into a format that can be stored as a session variable, such as JSON or XML, and deserializing them when retrieving from Session state.
16. **What are the performance considerations when using Session state?**
Performance considerations include minimizing the amount of data stored in Session state, using session compression, and choosing the appropriate session state mode based on application requirements and scalability needs.
17. **How do you handle session data cleanup in ASP.NET applications?**
Session data cleanup can be handled by implementing session end event handlers to release resources and remove expired session data, or by using session state providers with built-in cleanup mechanisms.
18. **Explain the significance of session locking in ASP.NET.**
Session locking prevents multiple requests from accessing and modifying session data simultaneously, ensuring data integrity and preventing race conditions in multi-threaded environments.
19. **What are the different session state modes available in ASP.NET Core?**
In ASP.NET Core, session state can be stored in-memory, distributed cache, or an external storage provider like Redis or SQL Server.
20. **How do you handle session expiration and renewal in ASP.NET Core?**
Session expiration and renewal can be configured in ASP.NET Core using session options in the Startup.cs file, specifying timeout values and handling session renewal logic as needed.