Visual Basic® 2010 Unleashed

Declaring Delegates

A delegate is defined via the Delegate keyword followed by the method signature it needs to implement. Such a signature can be referred to as a Sub or as a Function and may or may not receive arguments. The following code defines a delegate that can handle reference to methods able to check an email address, providing the same signature of the delegate:

Delegates Support Generics

Delegates support generics, meaning that you can define a Delegate Function (Of T) or Delegate Sub(Of T).

Notice that IsValidMailAddress is a type and not a method as the syntax might imply. emailAddress is a variable containing the email address ...