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8.3.8 VarIsNull

VarIsNull returns a Boolean True if the Subject variant contains the special Null value, otherwise, it returns a Boolean False.

     VarIsNull( Subject )

Example

This statement tests if the value in the grid cell is unknown or missing:

     If (VarIsNull( #grid_1.focusCell.value ))
        Use Builtin(MESSAGE_BOX_SHOW) With_Args(OK OK Information 'Variant' 'The value is unknown or missing.')
     Endif