Input for WinForms | ComponentOne
Handling Null and Empty Values / Entering Null and Empty Values
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    Entering Null and Empty Values
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    Unless in edit mask mode, the user can enter a null value in one of the following ways:

    If the user enters a null value (either by entering an empty string or NullText, see above), input string validation and parsing are skipped, see Input string validation (PreValidation) and Parsing (Updating) Data. However, PostValidation is performed in this case as in all others, see Typed value validation (PostValidation).