Wpf textbox text binding not updating
In the following example, the highlighted lines of code show that the As a result, the Text Block shows the same text (because the source changes) as the user enters text into the Text Box, as illustrated by the following screenshot of the sample: If you have a dialog or a user-editable form and you want to defer source updates until the user is finished editing the fields and clicks "OK", you can set the Update Source Trigger value of your bindings to Explicit, as in the following example: Note You can use the same technique for properties of other controls, but keep in mind that most other properties have a default Update Source Trigger value of Property Changed.
For more information, see the Update Source Trigger property page.
Note The Update Source Trigger property deals with source updates and therefore is only relevant for Two Way or One Way To Source bindings.
For Two Way and One Way To Source bindings to work, the source object needs to provide property change notifications.
The crazy thing is this Text Box’s are all defined the same way, i tried changing the name, the property and always the same thing, the binding for the last Text Box in the list doesn’t work at all. Here is a little hint @afree, I guess when writing into those Text Box’s you actually do it from the top most one and going down, thus the last one to get your changes is always the bottom most Text Box.
This topic describes how to use the Update Source Trigger property to control the timing of binding source updates. This means if an application has a Text Box with a data-bound Text Box.