Declaration of C # events

The declaration format of the event:

Attributes Event-modifiers Event type variable-declarators;
  Attributes Event-modifiers Event Type Member-name
  {event-accessor-declarations}

The modifier event-modifier for the event can be:
New
Public
Protected
Internal
Private
Static
Virtual
Sealed
Override
Abstract

Static,virtual,override and abstract modifiers can only appear at the same time. The declaration of an event can contain an event access description or rely on the compiler to provide an accessor automatically, or omit an event access description to define one or more events at a time. This explanation is omitted from the example above.

Note: The event access description must be omitted from an abstract event that uses the abstract modifier, otherwise the compiler prompts for an error.

The type declared by the event must be a representative (delegate) type, and the representative type should be declared in advance, as in the previous example, public delegate void EventHandler.