Wpf binding not updating propertychanged
Just make sure that you don't update the source value more often than you actually need to.
A very common problem, and one that’s usually a very simple fix once you’ve tracked it down.Default is, obviously, the default value of the Update Source Trigger.The other options are Property Changed, Lost Focus and Explicit.Instead, the source was updated only after focus was lost on the Text Box.
This behavior is controlled by a property on the binding called 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.