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The secret behind data binding comprises two objects that you don t ordinarily see: BindingContext and CurrencyManager (both of which are found in the System.Windows.Forms namespace). Every form provides a single, default BindingContext object, which it creates automatically. In turn, every BindingContext provides a collection of zero or more BindingManagerBase objects. When you create a new form, its BindingContext will be empty. But once you start binding data objects (either through complex or simple binding), this changes. Ordinarily, you ll find one BindingManagerBase object for each bound data object. For example, if you bind a DataView to eight different controls, your form will have a BindingContext with one BindingManagerBase object (because there s a single DataView). This BindingManagerBase ensures that all the controls are synchronized for example, it listens to a change of position in one control and updates the others accordingly. On the other hand, if you bind two different DataView objects to two different sets of controls, you ll wind up with two BindingManagerBase objects, one to synchronize each DataView.

Data Integrity Imagine the following common scenario: A customer places an order containing a number of line items through a database application that your team has designed. The application code that is responsible for recording the order to your database is responsible for performing the following three steps: 1. Generate a random 16-character order identifier. 2. Save the main order record. 3. For each line item, save the item information along with the order identifier, so that order items can be related to the main order record. Let s suppose that the application code generates the order identifier correctly and moves on to adding the main order record. However, there is a bug in the routine that prevents the main order record from being saved to the database. Furthermore, the code doesn t throw an error that would stop the code from adding the line items in the next step. So, not knowing any better, the application creates three line item records in the database with the order identifier that the routine generated. You now have a messy situation on your hands: items are entered into the database for an order that doesn t exist. You have inconsistent data.

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Note Technically, the BindingManagerBase doesn t communicate directly with the control. Instead, it

Summary

But there s another important detail. The BindingManagerBase is an abstract class, so it can t be created directly. Instead, the BindingContext actually contains instances of one of two classes that derived from BindingManagerBase either PropertyManager or CurrencyManager. The difference depends on the type of data source. If you re using simple binding to display the properties of an ordinary object (one that doesn t support the interfaces in Table 8-2), the PropertyManager is used. This is a relatively rare occurrence. Usually, you re binding a DataView, DataViewManager, or collection of items, and the more capable CurrencyManager is used instead. In other words, the CurrencyManager is designed to work with a list of items. The CurrencyManager object shoulders the responsibility for tracking the user s position in the bound data and synchronizing all the controls that are bound to it. To this end, the CurrencyManager provides a small set of properties, including Count, and the ever-important Position, which indicates an integer row index. It performs its work automatically. Figure 8-15 diagrams this relationship. There are really only three reasons that you might want to access the data-binding objects: To programmatically control record navigation. To programmatically react to record navigation. To create a new BindingContext that allows you to store a different position to the same data.

Note The concept of inconsistent data is often described as orphaned records because the parent, or

public AnimatedButtonBase() { SetStyle(ControlStyles.SupportsTransparentBackColor, true); } Next, you need to set the BackColor of your control to Color.Transparent. It s that easy! Now the OnPaintBackground() method will copy the form s background image, so that all your button painting is performed on top of that surface.

In this final chapter, you ve taken a look at the advanced code generation functionality in the ODT.NET package. You ve learned how to use ODT.NET to accomplish the following: Visually design a query within the Visual Studio IDE Generate strongly typed DataSet objects Visually design a UDT object Generate .NET classes from UDT objects Generate ASP.NET code from Oracle objects

main record, is absent while the child records exist. We cover how to handle orphaned records and data inconsistencies in 8.

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