C# 0 The Complete Reference

.NET Event Guidelines

C# allows you to write any type of event you desire. However, for component compatibility 

with the .NET Framework, you will need to follow the guidelines Microsoft has established 

for this purpose. At the core of these guidelines is the requirement that event handlers have 

two parameters. The first is a reference to the object that generated the event. The second is 

a parameter of type 

EventArgs

 that contains any other information required by the handler. 

Thus, .NET-compatible event handlers will have this general form:

void

handler

(object

source

, EventArgs 

arg

) {

   // ...

}

Typically, the 

source

 parameter is passed