Data binding can also mean that if an outer representation of the data in an element changes, then the underlying data can be automatically updated to reflect the change.For example, if the user edits the value in a Text Box element, the underlying data value is automatically updated to reflect that change.In WPF, dependency properties of elements can be bound to CLR objects (including ADO.
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.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.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.
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.
If the user enters an invalid date (invalid formatting or a past date), the user will be notified with a Tool Tip and a red exclamation point next to the Text Box.
The Data Validation section discusses how to create validation logic.
The figure demonstrates the following fundamental WPF data binding concepts: a binding source.