IsNull Function
Tests if a Variant contains the special Null value, indicating that the variable does not contain data.
Syntax:
IsNull (Var)
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Bool
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Var: Any variable that you want to test. This function returns True if the Variant contains the Null value, or False if the Variant does not contain the Null value.
Null - This value is used for a variant data sub type without valid contents.
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Sub ExampleIsNull
Dim vVar As Variant
MsgBox IsNull(vVar)
End Sub