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While these methods are certainly similar to the edit methods implemented earlier, there are some key differences in the way these new methods work Consider BeginEdit(), for example Every call to the existing BeginEdit() method will result in a new snapshot of the object s state, while only the first call to IEditableObjectBeginEdit() should be honored Any subsequent calls (and they do happen during data binding) should be ignored The same is true for the other two methods Remember, data binding only uses a single level of undo By definition, this means that only the first call to BeginEdit() through the IEditableObject interface has any meaning To implement the behavior of the IEditableObject methods properly, the object needs to keep track of whether the edit process has been started and when it ends At the same time, though, it is important to preserve the existing BeginEdit() functionality.

To highlight cells within a specific range of values, you can use the Highlight Cell Rules conditional formatting option. To make this formatting more flexible, you can type the minimum and maximum amounts on the worksheet, and refer to those cells in the conditional formatting. 1. In an empty cell in the workbook, type the minimum amount for the conditional formatting, and in another cell, type the maximum amount. In the sample workbook, the values are typed in cells E1 and F1. 2. In the pivot table, select the cells you want to format, and on the Ribbon, click the Home tab, and then in the Styles group, click Conditional Formatting. 3. In the list of conditional formatting options, click Highlight Cells Rules, and then click Between. 4. Delete the default value in the minimum box, and click the cell that contains the minimum value you typed. Delete the default value in the maximum box, and click the cell that contains the minimum value you typed on the worksheet (see Figure 4-12).

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This means implementing separate methods for IEditableObject, which will call the preexisting n-level undo methods when appropriate There is one other complication to deal with as well When a collection of objects is bound to a Windows Forms grid control, the user can dynamically add and remove child objects in the collection by using the grid control When an object is removed in this manner, the grid control does not notify the collection object Instead, it notifies the child object, and it s up to the child object to remove itself from the collection It is then up to the child to interact with its parent collection to be removed from the collection itself For this to happen, the child object needs a reference to its parent collection.

There are two technologies for handling large amounts of data, especially data transmission over the network: Asynchronous data transmission Background worker item thread

The ResourcesDataSource control takes care of data binding dealing with the Resources collection from the Project object. The GridView control in MainView is bound to this control, and the page handles its DeleteObject, SelectObject, and UpdateObject events.

Caution Excel worksheet protection can be easily circumvented. If you don t want users to view the

This is expressed through a Protected property named Parent, which is discussed later in the chapter, in the Root, Parent, and Child Behaviors section A flag is used to ignore multiple calls to the IEditableObject methods:.

Besides the standard conversions, you can also define both implicit and explicit conversions for your own classes and structs. The syntax for user-defined conversions is shown following. The syntax is the same for both implicit and explicit conversion declarations, except for the keywords implicit and explicit. The modifiers public and static are required. Keyword Source TargetType ( SourceType Identifier )

Note You can handle all these details manually. Prior to CSLA .NET 3.5, it was necessary to do this in all parent objects. Forgetting to do one of these steps (or doing one incorrectly) was one of the primary causes of bugs in pre3.5 objects.

The SmartDate type extends DateTime to provide the concept of an empty date. It also adds the ability to convert the value into and out of a string representation to simplify binding the value to a TextBox type control in the UI.

The FileAccess enumeration allows you specify whether you want to read and/or write to the FileStream that is created. The FileAccess values are described in Table 20-25. Table 20-25. FileAccess Values

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