Visual Basic in Easy Steps by Tim Anderson PDF

By Tim Anderson

ISBN-10: 1840780290

ISBN-13: 9781840780291

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Indicates whether a constant with a specified value exists in a specified enumeration. Overloaded. Converts the string representation of the name or numeric value of one or more enumerated constants to an equivalent enumerated object. Overloaded. NET value. Go ahead and play with the Enum type. There's a great deal that you can do with it to make your life easier. Delegates and Events Unlike procedural languages, Visual Basic is based on an event-driven programming model. The application responds to user-generated or system-generated events.

A typical practice is to create a protected class method to actually raise the event (to ensure that only the class and its derived types can actually fire the event). If the base class does not provide any method to raise an event, that event can be raised only by that base class; none of its derived classes will have that capability. NET Framework. Here is an example: Protected Sub OnMouseUp( e As MouseEventArgs ) RaiseEvent MouseUp( Me, e ) End Sub ... Left, 1, 0, 0, 0) ) That pretty much covers the publisher side of the event process.

Alternatively, you can specify a default value for your shared variables without a shared constructor this works well for simple initialization needs. If you need to do something more complicated (something that requires file I/O, for instance) you'll probably want to use the shared constructor instead. Visual Basic does automatically create a shared constructor for all of the initialization of shared variables if a shared constructor is not already specified. Even when you define your own shared constructor, Visual Basic will prepend the initialization code for all of your shared variables if necessary.

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Visual Basic in Easy Steps by Tim Anderson


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