• Defines the arguments to pass in an event.
• The EventArgs class is used to raise an event without any data.
  • Derive from EventArgs when you need to pass custom data, demonstrated below.

• Always use a class to pass event data via a delegate instead of defining separate parameters for each piece of event data.

public class MyEventArgs : EventArgs
{
    private string _someData;
 
    public MyEventArgs(string someEventData)
    {
        this._someData = someEventData;
    }
}