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By John Connell
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How the object performs these operations is its business. " This kind of implementation is one of the productive aspects of working with objects. To use an object you simply read or write its properties and call the methods that it exposes. The object is responsible for doing the real work. An object might be prepackaged like a form, or it might be one you write yourself. Inheritance As you can see, a form is a pretty smart object. It has all sorts of properties and methods that you can use immediately because they are part of the base class (also known as the parent class) that the form object inherits from.
Sub New is always called first and is called only once. New() 51 52 Notice, however, that the first line of Sub New is a call to the inherited class, which calls its constructor. Before any work is performed, the parent class's constructor is called. If a parent class is derived from yet another class, that class's constructor is called first, and so on up the chain. Constructor code gets called from the top of the inheritance chain down, with your derived class's constructor code called last.
Even though not much is going on at this point, we did set the Text property of the form to "Mirror Image" for a reason. NET object inherits a common set of characteristics and capabilities (properties, methods, and events) that are defined by the base class. However, each instance of an object you create with Sub New is an individual object with its own name. Each object can be separately enabled and disabled, placed in a different location on the form, and so on. Click the form's Close button to dismiss the form, and let's have some fun with our simple program while at the same time looking at the principles of object-oriented programming in action.