SQL Reporting Services Expression to evaluate if field is null &| white space -


I am creating a report and want to show the tax ID of an entity in a text box if someone is present. However, if no tax ID is present then there is only white space in that area. So if the field is white space then I do not want to show anything in the text box. 

  IIF (IsNothing (field! TAX_ID.Value), "", "Tax ID:" & vbCrLf & amp; Field! TAX_ID.Value)
< P> What do I do?

However, some can always try to evaluate it properly: 

  IIF (trim (field! TAX_ID.Value) = "", "", "tax id:" & amp; vbCrLf and field! TAX_ID.Value)

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