The refining of the data is done later, when the data is passed to another layer for processing.

Even with these constraints, it is usually still possible to enter values that are incorrectly formatted or invalid for some other reason.

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If the save is successful, the Save Button_Click method uses the application-level state dictionary to store a value indicating that a new fill-up has just been saved. After the navigation, if the Summary Page finds the value stored in the state dictionary, it shows the first pivot item so that the user can immediately see the results of the fill-up.

Doing so can cause your application or the operating system to stop responding.

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.

It returns a Dialog Result to detect wheather the OK or the Cancel button has been clicked.

The value can be obtained from the input/output parameter value.

Some checks are business rules and thus conceptually they must be done in the business layer of the multi-layer application or in the server-side of a client/server application.

But the key components, which the end-users interact with, are those which reside in the presentation layer.

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.

I have a windows form project in which I want to force the user to enter values in certain fields before he presses the calculate button at the bottom.