title: SSRS hide a row where a expression field value is blank
body: <p>I have a field in my SSRS report that derives a value based on an expression.  The expressions is a simple Lookup between 2 datasets and is working fine. It does return some NULL values and what I would like to do is not display the rows where the expression produces a NULL value. I know how to do this on a field that is not based on an expression but not on a field that is.  Anyone know how this can be done? Thanks</p>