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The Update Source Trigger property of the binding determines what triggers the update of the source.
The dots of the right arrows in the following figure illustrate the role of the Update Source Trigger property: If the Update Source Trigger value is Property Changed, then the value pointed to by the right arrow of Two Way or the One Way To Source bindings gets updated as soon as the target property changes.
Before going into the different features of data binding outlined above, we will first discuss in the next section the fundamental concepts that are critical to understanding WPF data binding.
A typical use of data binding is to place server or local configuration data into forms or other UI controls.
In WPF, this concept is expanded to include the binding of a broad range of properties to a variety of data sources.
As mentioned previously and as indicated by the arrow in the figure above, the data flow of a binding can go from the binding target to the binding source (for example, the source value changes when a user edits the value of a Text Box) and/or from the binding source to the binding target (for example, your Text Box content gets updated with changes in the binding source) if the binding source provides the proper notifications.
You may want your application to enable users to change the data and propagate it back to the source object.
The data binding functionality in WPF has several advantages over traditional models, including a broad range of properties that inherently support data binding, flexible UI representation of data, and clean separation of business logic from UI.
This topic first discusses concepts fundamental to WPF data binding and then goes into the usage of the Binding class and other features of data binding.For an example of data binding, take a look at the following application UI from the Data Binding Demo: The above is the UI of an application that displays a list of auction items.The application demonstrates the following features of data binding: to add the new product listing.Any existing grouping, filtering and sorting functionalities will apply to the new entry.In this particular case, the item entered in the above image will be displayed as the second item within the Text Box.In WPF, dependency properties of elements can be bound to CLR objects (including ADO.Tags: Adult Dating, affair dating, sex dating