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If they re so similar, why doesn t the UserControl derive directly from ContentControl The ContentControl type allows you to provide a custom template for the Content. In a UserControl, that would be redundant because the content template is the XAML file created when you created the UserControl. The UserControl also provides compile-time code generation for all the named (using x:Name) elements in the XAML file. The InitializeComponent function, called from the constructor, handles associating the elements in the XAML file with the generated properties. There s no magic; the code is simply loading the associated XAML using the equivalent of XamlReader.Load, then calling FindName for each expected element, and assigning the result to the named property. You could do this in your own code if you preferred to. If you create the more flexible but marginally more difficult custom controls, you ll perform many of these steps. The UserControl class is designed to represent a new control or extend an existing one. This class gives you the ability to organize small portions of a UI into more manageable components, which can then be used in your application or shared with other applications. The process to provide this kind of functionality involves:

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in order to send power to the voice coil electromagnet If you are lucky, the wiring will be easy to follow from the two fine wires coming directly from the voice coil, down the ribbon cable and out to the underside of the drive casing where the controller used to connect If you have to do it the hard way like I did, then get a 9-volt battery with two bare wires coming from it and randomly test the 12 or more points in pairs until you hear the drive arm pop to one side It may take a bit of trial and error, but you will eventually find the correct pair, and maybe if you re lucky along the way you will get to see the drive head burn up when you short it with the battery yeah, that d be cool When you do find the two points that make

This three-step process forms the ABCs of user-control development (Appearance, Behavior, and Call). Over the course of this section, as you create a LockableTextBox, you ll see how these three steps relate to one another.

The GridView is the only control we will be adding to the web form There is no web application equivalent of the OpenFileDialog control that we used in the Windows application in 14 Additionally, we would not want the user to select the location of the database In a Windows application, the database often may be on the user s computer Therefore, it is logical to have the user locate and select the database file using the OpenFileDialog control By contrast, in a web application, the database will not be on the user s computer, but rather a web server elsewhere on the Internet For security reasons, the user should not be permitted to browse the files on the web server as the user would for the files on their own computer Instead, the web application should specify where the database file is Often the database is located in a subfolder of the web application to ease the task of locating it through code, as will be discussed next By default, the ASPNET application created by Visual Studio 2005 has a subfolder named App_Data, likely short for application data Copy the nwindmdb (or Northwindmdb) file into the App_Data folder from wherever you saved nwindmdb when creating the Windows database application in 14 Now that you have located the database on your hard drive within the web application files, the remaining task is how to locate the database in code As discussed in 14, the ConnectionString property of the OleDbConnection object requires the path to and name of the database file In the Windows database application in 14, you obtained the path to and the

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