ISERROR is the best way. It will return TRUE if it is #NULL! and FALSE if its not. So it would look like
IF(ISERROR(S22), S1, S22& S23)
That will check is S22 is #NULL! and if it is, use S1. If its not, it will concatenate S22 and S23...
Posted by Brendan P. on May 12 2009 6:48PM { U40 , C1465 }