In the previous instalment in this tutorial we looked at the Data Context property of WPF controls.
This property can is set to an object to use as the source for its data bindings and those of its children.
In the earlier article we used simple bindings to display string and integer values that were controlled directly by the controls in a window.
When controls update a property that is also the direct source of other bindings, the user interface can update automatically.
In the previous article we saw how changes in a Text Box was not immediately sent back to the source.