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A homogenous collection of objects. The This includes any simple array in C#, first item in the list determines the type. and all classes based on the Array The first property in that type is object. displayed as the only column when bound to a data grid. A typed collection, such as our PhotoAlbum class. The type returned by the Item property is used as the assigned type, and all properties in this type can be displayed in a data grid. These can be bound to a data grid only at run time. With both interfaces available, the class may appear in Visual Studio .NET in the component tray and be bound to a data grid at design time. Most notably, classes derived from

Integrating a collection class with Visual Studio .NET is beyond the scope of this book. A control can be added to the Toolbox using the Customize entry in the Toolbox window s popup menu. This often requires members of the

This interface permits two-way notification of changes, both from the control to the class and from the class to the control.

Now we have to go back to 1971 again to look at a whole other branch of gaming: personal computer games When the microprocessor was invented, electronics hobbyists seized on it with delight Building a computer s central processing unit was too

The DataView class in the System.Data namespace implements this interface, allowing a data grid to update its contents when the underlying database is modified. The DataRowView class is a customized view of a row that supports transactional changes to the elements of the row. The DataRowView class supports this interface as well in order to provide appropriate feedback in a DataGrid control when an error occurs.

How much detail needs to be represented in the model and its components How much information needs to be contained in, or attached to, the model

The feature applies to variables and classes as well. As another example, when you begin typing the next line to set the Title property of the dialog box, you may see something like figure 2.4. Here Visual Studio displays the class properties, methods, and events available to the dlg variable. These correspond to the members of the OpenFileDialog class. Once again note how Visual Studio uses different icons for different types. In the figure, ShowDialog is a method and Title is a property. You can scroll through the dialog to locate an event such as Disposed or FileOk in order to see its icon. You will notice other statement completion popups as you type as well. One particularly nice feature is that signatures of methods are displayed as you type, and you can step through the various overloaded versions of a method using the arrow keys. In addition, as you will see in chapter 5, Visual Studio automatically picks up the classes and structures defined in your solution and incorporates them into these popup menus. Any documentation provided by <summary> tags within these classes is included as well, providing an automated forum for conveying important comments about a particular member to other programmers.

Figure 2.4 An example of statement completion for a class variable after typing the letter T for an OpenFileDialog class instance. Notice the small popup indicating that Title is declared as a string property in the FileDialog class.

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Of course, like any feature, all these popup windows require a certain amount of CPU and system resources. If you are running Visual Studio on a slower machine, or do not want such windows popping up, you can turn statement completion off in the Options dialog box. Click the Options item under the top-level Tools menu to display this dialog. Click the Text Editor settings, select the C# item, followed by the General item. This dialog is shown in figure 2.5. As you can see in the figure, you can disable the automatic listing of members, the display of parameter information, or both of these features. Other option settings are available here as well, of course. Feel free to look around and use the ever-ready Help button for any questions you may have.

Figure 2.5 The Visual Studio Options dialog box can be used to enable or disable the statement completion feature.

Back to our btnLoad_Click method, the code used here matches the code used for the MyForm program in chapter 1. Take another look at the InitializeComponent method in the Windows Form Designer generated code region. You will notice that Visual Studio has added the Click event handler for the btnLoad control.

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