Data binding is a connection between the User Interface and a business object or other data provider . The User Interface object is called the target, the provider of the data is called the source.
Data-binding assists with the separation of the User Interface level of your application from the other layers of your application (business objects, data, and so forth). This separation of responsibility is further reinforced by decoupling the UI target from its source through the use of a Binding object.
The binding object can be thought of as a black box with a universal connectors on one side for the target and on the other side for the source. There are switches on top, the most important of which is the Data Binding Mode switch which determines which way the data will flow.
Tutorials : The Official Microsoft Silverlight Site
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