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ActiveCurrencyTrader cls = new ActiveCurrencyTrader(); double converted = cls.ConvertTo( 100.0); Imagine the situation where the values to convert to and from are text. To keep things general, you would write the following code. public double ConvertToTextField(ActiveCurrencyTrader cls) { return cls.ConvertTo(int.Parse(text1.Text)); } The implementation of ConvertToTextField() makes one major mistake in that it assumes that you will always be converting a currency using the ActiveCurrencyTrader implementation. If you wanted to use the class HotelCurrencyTrader, you would need to implement another method with a parameter of type HotelCurrencyTrader. This problem is the classical polymorphism problem and is solved by using abstract methods. Consider the following rewritten ConvertToTextField() method. public double ConvertToTextField(CurrencyTrader cls) { return cls.ConvertTo(int.Parse(text1.Text)); } This implementation of ConvertToTextField() uses the CurrencyTrader base class, and since ConvertTo() and ConvertFrom() are declared, they can be referenced. How you call ConvertToTextField() and how you instantiate HotelCurrencyTrader or ActiveCurrencyTrader will not be covered in this chapter, because polymorphism is the subject of the next chapter. Just keep what you ve learned about the abstract keyword in mind as you read that chapter, which covers concepts such as interfaces, because you can do the same types of things with it.

Else ctrl.Visible = False End If Return End If Next End Sub Figure 21-23 shows the result after hiding two panels.

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The future of user interface is probably an entirely different approach to programmatic control creation. This approach, first popularized with the Web, is markup based. Rather than writing code to programmatically create and insert controls into a container, with markup-based user interface you write a template (typically in an XML-based format) that defines each control. The user interface framework parses this file and then creates the corresponding controls (typically one for each tag it finds). One of the goals of markup-based user interface language is to allow a proper separation between user interface code (the event handlers) and the user interface itself (the graphical widgets). In an ideal world, this separation would let professional graphic designers perfect the user interface look and feel without compromising the security or integrity of your code. Of course, it s also a great way to create flexible, extensible user interfaces. For example, you could build a tool for filling out forms (like the one shown earlier in this chapter) much more easily.

In this chapter, you learned some of the basics of object-oriented programming. The following are the key points to remember: Your code will be composed of structural or base class functionality, and architectural business-related functionality. Base class functionality is focused on a particular problem. The problem might be solved in a general manner, but only the particular problem is solved. Base class functionality requires specific knowledge of the field. Think of it as implementing a calculator where your main concern is ensuring that the calculations are correct. Architectural business-related functionality is higher-level functionality where general business knowledge is needed. The idea is to take the base classes, or base class related classes, and use them to solve a business problem. Think of it as using a calculator and your main concern is getting the results of the calculations. Properties should be used instead of exposing data members publicly.

Instead of writing the logic to interpret your own custom XML format, you could simply create a template for each form using a markup-based language like XAML or WFML.

Executing the preceding code produces the forms shown in Figure 8-6.

Note The idea of markup-based user interface is similar to the dynamic form generator shown in this

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