WithEvents and Handles clause requires form us to declare the object variable and the event handler as we write our code, so linkage is created upon compilation. On the other hand, with AddHandler and RemoveHandler, linkage is created and removed at runtime, which is more flexible.
Let’s assume that we want to load several MDI child forms, allowing each of them to be loaded only once, and of course to know when one of the child forms is closed. Since we have several forms to load we would like to use the AddHandler and RemoveHandler keywords so we can be flexible and write the minimal code we can.
Let’s get dirty.
1. In each MDI child form we have to declare a public event.
Public Event FormClosed(ByVal f As Form)
2. In each MDI child form we have to use the Form_Closed method which handles the MyBase.Closed class and raise the FormClosed event.
Private Sub Form1_Closed(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Closed
RaiseEvent FormClosed(Me)
End Sub
3. On our MDI form we need to declare two member variables. The first’s of type Form and the second’s type is...
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