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One little bug remains. When we delete all the items, the text boxes and date picker are bound to nothing. This doesn t crash the program; it just means the user can type in details that go nowhere. There are a couple of ways we could fix this. In the list change notification handler, we could look at the number of entries, and disable everything except the New button to make it clear that there s nothing to edit right now. Or we could handle change notifications in the text boxes text box controls raise a TextChanged event, and we could handle that (as well as changes to the date picker or description) and create a new entry if the user types into an empty list. Since neither of these would illustrate anything you haven t already seen we ll leave this part up to you.

Summary

Windows Forms provides a .NET wrapper around the Win32 user interface model. Visible elements are represented as objects that derive from the Control base class. Control features are configured with normal .NET properties, and we can use ordinary C# event handlers to respond to user input. Data binding automates some aspects of connecting data to the screen, although the support in Windows Forms is not as comprehensive as in WPF, and we needed to do some extra work to get the effect we required on the control we wanted to use. Windows Forms may be less powerful than WPF, but it has a smaller memory footprint and may be more suitable on low-end hardware, or if you need to use controls that are available only for Windows Forms.

ftp A 192.168.1.7 www A 192.168.1.8 ns2 A 192.168.1.9 proxy A 192.168.1.10 Our zone file consists of four major sections identified as resource records. The first is @ IN SOA ns.pvctoyfan.com. hostmaster.pvctoyfan.com. (...)

A constructor is a special method which allows you to perform some setup when you create an instance of a class. Just like any other method, you can provide it with parameters, but it doesn t have an explicit return value. Constructors always have the same name as their containing class. Example 3-6 adds a constructor that takes the plane s identifier. Because the constructor is a member of the class, it s allowed to use the Identifier property s private setter.

class Plane { public Plane(string newIdentifier) { Identifier = newIdentifier; } public string Identifier { get; private set; }

}

This is a start of authority (SOA) resource record. SOA gives information about the zone, its originating machine, and who administers this domain. There can only be one SOA resource record per zone file, and it can be split over several lines.

Notice how the constructor looks like a standard method declaration, except that since there s no need for a return type specifier, we leave that out. We don t even write void, like we would for a normal method that returns nothing. And it would be weird if we did; in a sense this does return something the newly created Plane it just does so implicitly. What sort of work should you do in a constructor Opinion is divided on the subject should you do everything required to make the object ready to use, or the minimum necessary to make it safe The truth is that it is a judgment call there are no hard and fast rules. Developers tend to think of a constructor as being a relatively low-cost operation, so enormous amounts of heavy lifting (opening files, reading data) might be a bad idea. Getting the object into a fit state for use is a good objective, though, because requiring other functions to be called before the object is fully operational tends to lead to bugs. We need to update our Main function to use this new constructor and to get rid of the line of code that was setting the property, as Example 3-7 shows.

static void Main(string[] args) { Plane someBoeing777 = new Plane("BA0049"); Console.WriteLine( "Your plane has identifier {0}", someBoeing777.Identifier); } Console.ReadKey();

Note: The @ symbol on the SOA is a shorthand for the domain name that is represented by this zone file. In the

Notice how we pass the argument to the constructor inside the parentheses, in much the same way that we pass arguments in a normal method call. If you compile and run that, you ll see the same output as before but now we have an identifier that can t be changed by users of the object.