By J. Reilly Douglas
Provides the most recent instruments and techniques-and wealthy, reusable code samples-that builders have to construct high-performance net options with ASP.NET.
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For developers familiar with working under the constraints of VBScript in ASP, the improvements are nothing short of earth shattering. Inheritance and Polymorphism In recent versions, Visual Basic has tried to become a more object-oriented language, with some success. To be considered object oriented, a language must meet three primary requirements. The language must be polymorphic, meaning that you can call a method of an object and, depending on the exact type of the object, different underlying methods are called.
NET, the Set keyword is no longer allowed. NET involves changes to the way parameters are passed to functions and subroutines. In earlier versions of Visual Basic, by default, all parameters were passed in by reference. A parameter passed in by reference means that instead of getting a copy of the parameter, the parameter is really a pointer to the parameter being passed. ) will result in two different values, as shown in Figure 3-2. Figure 3-2 : Message box displayed after calling CallingByReference The ability to modify parameters is often useful, but it can sometimes confuse beginners.
Sometimes the result is a working program, because the presence or absence of the Set keyword was the problem, but as often as not the real problem remains hidden until you look at the code more closely. Why was the Set keyword ever used? 0 and earlier, objects had default properties that didn’t require a parameter. bar should be set to o or whether foo should be set to o. NET eliminates the need for using Set by eliminating parameterless default properties. NET, the Set keyword is no longer allowed.