ASP.NET 4 Unleashed

Inheritance and Abstract Classes

When one class inherits from a second class, the inherited class automatically includes all the nonprivate methods and properties of its parent class. In other words, what’s true of the parent is true of the child, but not the other way around.

Inheritance is used throughout .NET Framework. For example, every ASP.NET page inherits from the base System.Web.UI.Page class. The only reason that you can use properties such as the IsPostback property in an ASP.NET page is that the page derives from the base Page class.

All classes in .NET Framework derive from the base System.Object class. The Object class is the great-grandmother of every other class. This means that any methods or properties of the Object class, such ...