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We will discuss these classes and properties in more detail as we build our example. As a brief explanation, the BindingContext class manages a collection of BindingManagerBase objects. While any control can create an instance of this class in its BindingContext property, the Form class creates one automatically to serve as the 590

Of course, an object of TwoDShape has no knowledge of or access to any classes derived from TwoDShape

// Return a zero balance static double GetZeroBal() { ConsoleWriteLine("In GetZeroBal()"); return 00; } static void Main() { double balance = 12375; double currentBalance; // Here, GetZeroBal( ) is not called because balance // contains a value currentBalance = balance GetZeroBal(); ConsoleWriteLine(currentBalance); } }

default container for all data bound to the form In our case, we will simply use the default BindingContext for our form, and not discuss this class in too much detail A single BindingManagerBase object exists for each bound data object In our case, with a single PhotoAlbum object bound to our controls, our application will have a single BindingManagerBase created For an object with multiple members, such as a database with multiple tables, a BindingManagerBase will exist for each member bound to a control A ControlBindingsCollection object contains the collection of actual bindings created for a control The DataBindings property in the Control class contains the collection of these binding objects Each binding object is a Binding class instance The Binding class permits any property of any control to be bound to any column or property of a data source We will see this in our application shortly.

In this program, the method GetZeroBal( ) is not called because balance contains a value As explained, when the left-hand expression of contains a value, the right-hand expression is not evaluated

Let s discuss the previous table from the bottom up, beginning with the Binding class Typically, it is not necessary to access this class directly Even so, it is likely useful to see the properties that make up each individual binding, so a summary of this class appears in NET Table 176 Note that the possible data sources for simple data binding correspond to those shown earlier in the chapter for the DataGrid control As you can see, this class is fairly generic, and permits any property to be bound to pretty much anything The Format and Parse events can even be used to specify exactly how this binding will take place when converting between the data source and the control s property If you are thoroughly confused at this point, don t fret.

Nullable objects can be used in relational expressions in just the same way as their corresponding non-nullable types However, there is one additional rule that applies When two nullable objects are compared using the <, >, <=, or >= operators, the result is false if either of the objects is null For example, consider this sequence:

byte lower = 16; byte upper = null; // Here, lower is defined, but upper isn t if(lower < upper) // false

We will lay this out step by step for our application, which should aid your understanding Let s start with a summary of exactly what should be bound to what The following table shows our controls, the property in each control that we would like to bind, and the member of the Photograph object within our PhotoAlbum data source that can provide this value..

Here, the result of the test for less than is false However, somewhat counterintuitively, so is the inverse comparison:

The Binding class represents a simple data binding between a data source entry and a Windows Form control. The Binding instances defined for a control are contained by the DataBindings property of that control. This class is part of the System.Windows.Forms namespace. Binding Public Constructor Create a new Binding instance. This has the following signature:

if(lower > upper) // also false!

There have been a number of books and thousands of articles and papers written about EVs, both technical and nontechnical Here are some available related books and manuals, and a sampling of a few nontechnical articles that will give you instant expertise in the subject area