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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.To establish a binding, you use the Binding object.The rest of this topic discusses many of the concepts associated with and some of the properties and usage of the Binding object.Data binding is the process that establishes a connection between the application UI and business logic.If the binding has the correct settings and the data provides the proper notifications, then, when the data changes its value, the elements that are bound to the data reflect changes automatically.

Bindings that are Two Way or One Way To Source listen for changes in the target property and propagate them back to the source. For example, you may edit the text of a Text Box to change the underlying source value.However, if the Update Source Trigger value is Lost Focus, then that value only gets updated with the new value when the target property loses focus.Similar to the Mode property, different dependency properties have different default Update Source Trigger values.Content Controls such as Button and Items Controls such as List Box and List View have built-in functionality to enable flexible styling of single data items or collections of data items.Sort, filter, and group views can be generated on top of the data.

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The following figure illustrates the different types of data flow: Note that to detect source changes (applicable to One Way and Two Way bindings), the source must implement a suitable property change notification mechanism such as INotify Property Changed.

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