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VBScript IsNull Function


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The IsNull function returns a Boolean value that indicates whether a specified expression contains no valid data (Null). It returns True if expression is Null; otherwise, it returns False.

Syntax

IsNull(expression)

Parameter Description
expression Required. An expression

Example

Example

<%

Dim x
response.write(IsNull(x) & "<br />")
x=10
response.write(IsNull(x) & "<br />")
x=Empty
response.write(IsNull(x) & "<br />")
x=Null
response.write(IsNull(x))

%>

The output of the code above will be:

False
False
False
True

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