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Platform : WPF
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Category : DataBinding

How do I update the source as I type in a TextBox?

The source can be updated using the "UpdateSourceTrigger" property of the TextBox. By default, the "UpdateSourceTrigger" property is set to ’LostFocus’, i.e. the source is updated when the data-bound TextBox loses the focus. By setting the "UpdateSourceTrigger" property to ’PropertyChanged’, the source will be updated as you type in a TextBox.

In the following code snippet a TextBox’s "Text" property is bound with the Button’s "Width" property. On changing the Text in the TextBox, the Width of the Button is updated.

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