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If the value is what you expected, then data binding is not your issue.

Here is a simple value converter that breaks into the debugger.

Once upon a time there were four friends – two Text Boxes and two Combo Boxes.

They all lived happily on a WPF Window bound together in blissful MVVM harmony.

Here is a sample When you don’t see anything displayed in your UI, it is hard to tell whether it’s data binding causing your issue or a problem with the visual layout of the control.

You can eliminate the data binding as the problem by adding a value converter and break into the debugger.

Unfortunately the changed Combo Boxes becomes unsynchronized with the view model if the view model ignores a change. You can change either Text Box as many times as you want.

You can reuse a user control over and over and the logic is isolated from the general flow of your program. Custom control can be (and is sometimes are required to be) templated (for example, a Data Template). This is confusing to XAML developers because they are accustomed to binding to CLR properties that implement INotify Property Changed in their view models. A data binding source source CAN be a CLR-type property.

On cancel, I wanted to disregard the Combo Box change and revert back to the previously selected entity.) So based on business rules, we’ve ignored a change to the view model.

The Text Boxes always remain synchronized – reverting back to the previous value if the change is ignored.

Unless you are constantly checking every UI element and monitoring the output window for binding errors, you will not always catch that you have a data binding problem.

NET Developer Group a few days ago, someone in the audience asked a question about the data binding system which piqued my interest.

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