In this case, bindings are set directly to the appropriate data classes, which have float properties.
On save, the entered values persist only if they can be parsed as floats.
However, not all of the values being checked are supplied by the user, so some initialization must occur beforehand.
Specifically, the distance driven must be calculated by comparing the Fillup.
Finally, the Save Fillup method returns the Save Result object.
Silverlight for Windows Phone provides basic, built-in binding validation through the Binding.
On Back Key Press method and check for unsaved changes.