To get a textbox updated when a property changes its value, implement your property from INotifyPropertyChanged.
http://www.abhisheksur.com/2010/05/object-notifiers-using.html[
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You should also note, binding will not work if you explicitly set TextBox.Text somewhere in code behind.
Try removing any code that directly accesses your textbox, and update your text only from your ViewModel.
I hope it will work. :rose: