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At this point in the chapter, you have seen numerous ways to interact with the types of ADO.NET in a wizard-free manner. While it is (most definitely) true that understanding the ins and outs of working with your data provider is quite important, it is also true that this can lead to hand cramps from typing the large amount of boilerplate code. To wrap things up, therefore, I d like to point out a few data-centric wizards you may wish to make use of. Be aware that I have no intention of commenting on all of the UI-centric data wizards provided by Visual Studio 2005, but to illustrate the basics, let s examine some additional configuration options of the DataGridView widget. Assume you have created a new Windows Forms application that has a single Form containing a DataGridView control named inventoryDataGridView. Using the designer, activate the inline editor for this widget, and from the Choose Data Source drop-down listbox, click the Add Project Data Source link (see Figure 22-22).

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Figure 22-22. Adding a data source This will launch the Data Source Configuration Wizard. On the first step, simply select the Database icon and click Next. On the second step, click New Connection and establish a connection to the Cars database (using the same set of steps described earlier in this chapter within the Connecting to the Cars Database from Visual Studio 2005 section). The third step allows you to inform the wizard to store the connection string within an external App.config file (which is generally a good idea) within a properly configured <connectionStrings> element. As the final step, you are able to select which database objects you wish to account for within the generated DataSet, which for your purposes here will simply be the Inventory table (see Figure 22-23).

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Once you complete the wizard, you will notice that the DataGridView automatically displays the column names within the designer. In fact, if you run your application as is, you will find the contents of the Inventory table displayed within the grid s UI. If you were to examine the code placed in your Form s Load event, you would find that the grid is populated with the line of code highlighted in bold: public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void MainForm_Load(object sender, EventArgs e) { // TODO: This line of code loads data into // the 'carsDataSet.Inventory' table. // You can move, or remove it, as needed. this.inventoryTableAdapter.Fill(this.carsDataSet.Inventory); } } To understand what this line of code is in fact doing, you need to first understand the role of strongly typed DataSet objects.

You then examined the C# event keyword which, when used in conjunction with a delegate type, can simplify the process of sending your event notifications to awaiting callers. As shown via the resulting CIL, the .NET event model maps to hidden calls on the System.Delegate/System.MulticastDelegate types. In this light, the C# event keyword is purely optional in that it simply saves you some typing time. Finally, this chapter examined a new C# 2005 language feature termed anonymous methods. Using this syntactic construct, you are able to directly associate a block of code statements to a given event. As you have seen, anonymous methods are free to ignore the parameters sent by the event and have access to the outer variables of the defining method. Last but not least, you examined a simplified way to register events using method group conversion.

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n this chapter, you ll deepen your understanding of the C# programming language by examining a number of advanced (but still quite useful) syntactic constructs. To begin, you ll learn how to construct and use an indexer method. This C# mechanism enables you to build custom types that provide access to internal subtypes using an array-like syntax. Once you learn how to build an indexer method, you ll then examine how to overload various operators (+, , <, >, and so forth), and create custom explicit and implicit conversion routines for your types (and you ll learn why you may wish to do so). The later half of this chapter examines a small set of lesser used (but nonetheless interesting) C# keywords. For example, you ll learn how to programmatically account for overflow and underflow conditions using the checked and unchecked keywords, as well as how to create an unsafe code context in order to directly manipulate pointer types using C#. The chapter wraps up with an examination of the role of C# preprocessor directives.

As programmers, we are very familiar with the process of accessing discrete items contained within a standard array using the index operator, for example: // Declare an array of integers. int[] myInts = { 10, 9, 100, 432, 9874}; // Use the [] operator to access each element. for(int j = 0; j < myInts.Length; j++) Console.WriteLine("Index {0} = {1} ", j,

myInts[j]);

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