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Home > Available Help Files > PC-DMIS BASIC Language > Language Reference A – Z > IsNull Function
Current Help File: PC-DMIS Basic (View Core Help)
IsNull(v)
Returns a value that indicates if a variant contains the NULL value.
The parameter v can be any variant. IsNull returns a TRUE if v contains NULL. If isNull returns a FALSE the variant expression is not NULL.
The NULL value is special because it indicates that the v parameter contains no data. This is different from a null-string, which is a zero length string and an empty string which has not yet been initialized.