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So first a couple of best practice guidelines: With modern computers which have large amounts of memory there is little reason to use float rather than double.Therefore you should not use float in favour of double unless you have a valid and defensible reason to do so.Problem is, I'm not really sure where to go from there because I don't know if it's possible.When the value is read in, I need to return a message to the user if the value is incorrect and prompt them to re-enter until they get it right.In this case, we simply clear any error messages in the error provider.The Name textbox works very similarly but we don’t have quite as elaborate validation logic.

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This is the reason I suggest reading the value in in cents and store it in an integer.If working with a fixed point (fixed number of decimal places) then it is often easier and more accurate if using comparisons to use integer types rather than floating point types.For instance in the case of currency assuming you are using $ rather than hold $ as a float hold cents as an integer.If the user enters invalid data they’ll see an icon shown in Figure 3.After the validating event returns without being cancelled, meaning we have valid user input, then the validated event will be raised.Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.

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