What are the main system events you could name?

Main system events in C# are often related to the application's lifecycle and interaction with the OS. These include:

• Application Domain events: for example, AppDomain.ProcessExit — triggered when the process is ending.
• Garbage Collection events: related to the garbage collection process.
• File system events: using the FileSystemWatcher class to monitor changes in the file system (creation, modification, deletion of files).
• System events in Windows Forms or WPF: such as Load, Closing, Closed for forms.
• Timer events: for example, System.Timers.Timer.Elapsed.

Example of using a process exit event:

AppDomain.CurrentDomain.ProcessExit += (s, e) => {
    Console.WriteLine("Application is exiting.");
};