How to check for Is Not Null in VBA?

Hi I have the following expression. I'm trying to say "if the second field Is Not 开发者_如何学PythonNull". Can you help.

Thanks

=Iif((Fields!approved.Value = "N" & Fields!W_O_Count.Value IsNotNull), "Red", "Transparent")

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Use Not IsNull(Fields!W_O_Count.Value)

So:

=IIF(Fields!approved.Value = "N" & Not IsNull(Fields!W_O_Count.Value)), "Red", "Transparent")

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you can do like follows. Remember, IsNull is a function which returns TRUE if the parameter passed to it is null, and false otherwise.

Not IsNull(Fields!W_O_Count.Value)