How do I make my data-bound TextBox update the source value as I type?

By default, TextBox. Text has an UpdateSourceTrigger value of LostFocus. This means if you have a data-bound TextBox, the default behavior is that the source does not get updated until the TextBox loses focus.

If you want the source to update as you type into the TextBox, set the UpdateSourceTrigger property to PropertyChanged: One thing that’s really easy to miss is that the UpdateSourceTrigger default value varies for different properties. For most properties, the UpdateSourceTrigger property defaults to PropertyChanged. However, for TextBox.

Text, it is LostFocus. More.

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