Wpf binding not updating source

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Yet for all its power, it is a little complex and that is my reason for launching into this blog series.The rough outline for this series is as follows: To understand what databinding is and the service it provides us with, it is worth looking at how you wire-up a user-interface without using databinding.In some situations, it is not possible for a control to realise that the value to which it is bound has been changed.For example, if a read-only property is calculated according to other, data-bound properties, controls that are linked to the calculated value will not normally update.I don't usually write tutorial blog posts and series, preferring instead to develop new controls or novel techniques.

Text property has a default Update Source Trigger value of Lost Focus.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.To see how all of these options work, I have updated the example from the previous chapter to show you all of them: As you can see, each of the three textboxes now uses a different Update Source Trigger.The first one is set to Explicit, which basically means that the source won't be updated unless you manually do it.

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