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))
%>
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
Show Example »
False
False
True
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