WPF two-way binding not working

Question

I have a data context (UserPreferences) assigned to my main window, and a textbox that binds two-way to a property within one of the data context\'s properties

Answer 1

By default, the Text property of TextBox is updated only when the focus on it is lost. Did you verify it with your DataContext?

If you want to override this behaviour, you have to include the property UpdateSourceTrigger in this way:

Text="{Binding Path=SelectedCollectionDevice.BaudRate, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}

Setting UpdateSourceTrigger's value to PropertyChanged, the change is reflected in the TextBox when you change the value of your bound property, as soon as the text changes.

A useful tutorial about the usage of UpdateSourceTrigger property is here.