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The purpose of this article is to explain what is Data Binding and how it is working in Native Script.
If the value is what you expected, then data binding is not your issue.
Then the binding is described in the XML (using a mustache syntax).
With an XML declaration, only the names of the properties are set - for the target: text, and for source: text Source.
Here is a simple value converter that breaks into the debugger.
To use the value converter, reference the namespace of the assembly that contains the converter and add an instance of it to the resources of your window.
Data binding establishes a connection between the application UI and business logic. You no longer have to write code that updates your UI or pass values down to your business logic.