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Now that we’ve got a decent understanding of the common binding properties of a Selector control (I hope! Given the following classes (only class signatures; the full sample project including source code is attached to this post): Note the use of “Mode=One Way” in my Items Source bindings.This indicates to the binding that we’re only going to be updating the binding target (the Combo Box’s Items collection in this case).For those situations where you need more control of the process, this property will definitely help though.Just make sure that you don't update the source value more often than you actually need to.This behavior is controlled by a property on the binding called Update Source Trigger.

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Try running the example on your own machine and see how the three textboxes act completely different: The first value doesn't update before you click the button, the second value isn't updated until you leave the Text Box, while the third value updates automatically on each keystroke, text change etc.

For that reason, I have added a button next to the Text Box, which will update the source value on demand.

In the Code-behind, you will find the Click handler, where we use a couple of lines of code to get the binding from the destination control and then call the Update Source() method on it.

This is fine for check boxes and other simple controls, but it is usually not appropriate for text fields.

Updating after every keystroke can diminish performance and it denies the user the usual opportunity to backspace and fix typing errors before committing to the new value.

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