Como: Manipular eventos de aplicativo (Visual Basic)
Visual Basic provides several application-level events including Startup, Shutdown, StartupNextInstance, and UnhandledException. Code for these events is stored in the ApplicationEvents.vb partial class file, which is hidden by default. You can access the Code Editor window for application events from the Application page of the Project Designer.
To access code for application events
Select a project in Solution Explorer, and then on the Project menu, click Properties.
Select the Application page.
Click the View Application Events button to open the Code Editor.