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VBS

IsNull()


Description

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.

This function has the form:

IsNull(expression)
Parameter Description
expression (required) An expression

Examples

The following example shows the basic use of this function:

Dim x
Msgbox(IsNull(x))
x=10
Msgbox(IsNull(x))
x=Empty
Msgbox(IsNull(x))
x=Null
Msgbox(IsNull(x))

This produces the following result (each line in a separate pop-up message box):

False
False
False
True

Miscellaneous Information

Supported in Version: 1.0


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