Wpf textblock text binding not updating
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.
It defaults to the value "Default", which basically means that the source is updated based on the property that you bind to.
As of writing, all properties except for the Text property, is updated as soon as the property changes (Property Changed), while the Text property is updated when focus on the destination element is lost (Lost Focus).
The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to Update Source on the Binding.
This behavior is controlled by a property on the binding called Update Source Trigger.
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As the Slider was manipulated, the Text Block showed the changing value.
In some situations, it is not possible for a control to realise that the value to which it is bound has been changed.