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Even with these constraints, it is usually still possible to enter values that are incorrectly formatted or invalid for some other reason.
The following code shows the Save Button_Click event handler in the Fillup Page class.
If values have been entered into each Text Box, an attempt is made to parse the values into values of type float.
If parsing fails, a Message Box is displayed indicating the failure to the user.
If parsing succeeds, the code calls the Save Fillup method, passing it an error callback.
This delegate simply displays the error condition in a message box.