Data Formatting and Conversion
In a basic binding, the information travels from the source to the target without any change. This seems logical, but it's not always the behavior you want. Your data source may use a low-level representation that you don't want to display directly in your user interface. For example, you may have numeric codes you want to replace with human-readable strings, numbers that need to be cut down to size, dates that need to be displayed in a long format, and so on. If so, you need a way to convert these values into the correct display form. And if you're using a two-way binding, you also need to do the converse—take user-supplied data and convert it to a representation suitable for storage in the appropriate data object. ...
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