C# 0 The Complete Reference

PART I

C h a p t e r   1 5 :  

D e l e g a t e s ,   E v e n t s ,   a n d   L a m b d a   E x p r e s s i o n s  

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PART IPART I

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In multithreaded applications, you will usually need to synchronize access to the event 

accessors. For information on multithreaded programming, see Chapter 23.

Miscellaneous Event Features

Events can be specified in interfaces. Implementing classes must supply the event.

Events can also be specified as 

abstract

. A derived class must implement the event. 

Accessor-based events cannot, however, be 

abstract

.

An event can be specified as 

sealed

.

Finally, an event can be virtual, which means that it can be overridden in a derived class.