List the major built-in objects in ASP.NET?

In ASP.NET, there are several major built-in objects that are fundamental to the framework’s functionality. Here’s a list of some of the key ones:

1. HttpContext: Represents the current HTTP request and response, providing access to request-specific information such as headers, cookies, and form data.
2. HttpRequest: Represents the client’s HTTP request and provides properties and methods to access request data like headers, query string parameters, and form data.
3. HttpResponse: Represents the HTTP response that will be sent to the client, providing methods and properties to control aspects of the response such as headers, status codes, and content.
4. HttpServerUtility: Provides various utility methods for working with the server environment, such as file operations, executing code on the server, and URL encoding.
5. HttpApplication: Represents the global application class for ASP.NET applications and serves as the entry point for handling application-level events such as application start, end, and error handling.
6. HttpSessionState: Represents session state information for a user session and allows storing session-specific data that persists across multiple requests from the same client.
7. HttpCookieCollection: Represents a collection of cookies associated with the current request or response, allowing you to read, add, and remove cookies.
8. Server: Provides utility methods for working with server controls and managing aspects of the server environment within ASP.NET pages and code-behind files.
9. Cache: Represents the cache of objects that can be stored in memory to improve performance by reducing the need to recreate or retrieve data frequently.
10. Application: Represents the application state, allowing you to store and retrieve global data that is accessible to all users and sessions within the application.

Understanding these built-in objects and how to utilize them effectively is essential for developing robust and efficient ASP.NET applications.