conditional formatting with nulls.

I'm trying to change the background color of a textbox based on values. Right now I have values that have nulls but I can't seem to get that to work. I want the background to be white if null. This is what I have tried so far.

=SWITCH(Fields!field1.Value < 90,"Red",
Fields!field1.Value = "","white",
Fields!field1.Value is nothing,"white")
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ValentinoVConnect With a Mentor BI ConsultantCommented:
The Switch function evaluates from first to last expression, this should have a better result:

=SWITCH(IsNothing(Fields!Field1.Value), "White",
  Fields!Field1.Value < 85,"Red")

If that still doesn't work, try this:

=IIF(IsNothing(Fields!Field1.Value), "White",
  Switch(Fields!Field1.Value < 85,"Red", true, "White"))
Try this instead -

=IIF(IsNothing(Fields!field1.Value), "White", "Red")

This will set the background to white if field1 is empty and red if it contains a value.
NickMalloyAuthor Commented:
It can't be read for any value. It has to be red only if the condition applies. I tried this and it still colors red when the item is blank.

=SWITCH(Fields!Field1.Value < 85,"Red",
IsNothing(Fields!Field1.Value), "White")
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