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In .NET 3.5, Microsoft introduced the System.ComponentModel.INotifyPropertyChanging interface so business objects can indicate when a property is about to be changed. Strictly speaking, this interface is optional and isn t (currently) used by data binding. For completeness, however, it is recommended that this interface be used when implementing INotifyPropertyChanged. The INotifyPropertyChanging interface defines the PropertyChanging event that is raised before a property value is changed, as a complement to the PropertyChanged event that is raised after a property value has changed.

The main edit forms in the application are user controls that inherit from the WinPart base control. This base control provides functionality that is used by the main form when it needs to interact with the user controls it contains. The end result is that the main form can implement the Documents menu, notify user controls when the user logs in or out, and handle other basic interactions the user would expect.

All user controls that are to be displayed on MainForm must inherit from the WinPart base control. This control adds common behaviors used by the code in MainForm to manage the display. It inherits from UserControl: public partial class WinPart : UserControl

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All business collections should implement the interface called System.ComponentModel.IBindingList. The simplest way to do this is to have the collection classes inherit from System.ComponentModel. BindingList<T>. This generic class implements all the collection interfaces required to support data binding: IBindingList IList ICollection IEnumerable ICancelAddNew IRaiseItemChangedEvents As you can see, being able to inherit from BindingList<T> is very valuable. Otherwise, the business framework would need to manually implement all these interfaces. This interface is used in grid-based binding, in which it allows the control that s displaying the contents of the collection to be notified by the collection any time an item is added, removed, or edited so that the display can be updated. Without this interface, there s no way for the data binding infrastructure to notify the grid that the underlying data has changed, so the user won t see changes as they happen. Along this line, when a child object within a collection changes, the collection should notify the UI of the change. This implies that every collection object will listen for events from its child objects (via INotifyPropertyChanged) and in response to such an event will raise its own event indicating that the collection has changed.

In order to best follow along with the examples in the remaining chapters, you should probably download and install SugarCRM. The community edition of SugarCRM is available for download at http://www.sugarcrm.com/crm/download/sugar-suite.html. You have two options for installing SugarCRM from this site. One option is to download the zip archive that contains the application, and install it on your local machine or Web Server. In order to do this, you ll need the following components installed and configured: Web Server: Either Apache 1.3 or later or IIS 6 or later with FastCGI installed if you are using Windows. PHP: Version 5.2.1 or later installed and configured to be used with the above Web Server. Database Server: Either MySQL 5.0 or later or SQL Server 2005 or later.

Somewhat like the BusinessBase class in CSLA .NET, WinPart implements a GetIdValue() method that should be overridden by all user controls. The value returned in this method is used as a unique

In .NET 3.0, Microsoft introduced a new option for building lists for data binding. This new option only works with WPF and Silverlight and is not supported by Windows Forms or Web Forms. The System.ComponentModel.INotifyCollectionChanged interface defines a CollectionChanged event that is raised by any list implementing the interface. The simplest way to do this is to have the collection classes inherit from System.ComponentModel.ObservableCollection<T>. This generic class implements the interface and related behaviors. When implementing a list or a collection you must choose to use either IBindingList or INotifyCollectionChanged. If you implement both, data binding in WPF will become confused, as it honors both interfaces and will always get duplicate events for any change to the list. You should only choose to implement INotifyCollectionChanged or use ObservableCollection<T> if you are absolutely certain your application will only need to support WPF or Silverlight and never Windows Forms. Because CSLA .NET supports Windows Forms and Web Forms along with WPF, the list and collection types defined in the framework implement IBindingList by subclassing BindingList<T>.

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