Microsoft Access Function Library: IsNull()

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Function: IsNull()

Purpose: The IsNull function returns a value of true if the referenced variable contains a null value. Otherwise, it returns false.

Usage: IsNull(variable_name)

Where variable_name is the name of the variable you wish to test.

Returns: True if the referenced variable contains the null value; False otherwise.

Example

Dim TestEmpty
Dim TestQuote
Dim TestNull

TestQuote = ""
TestNull = Null

IsNull(TestEmpty) returns False
IsDate(TestQuote) returns False
IsDate(TestNull) returns True