Expression in SSRS to deal with Column containing NULLS

Hi,Wonder if someone can help:I have column (Pccount) which displays as follows:NULLNULLNULL10101010NULL10NULLI want to do an expression on Pccount to display the word "NONE" when the entire column is full of ALL Nulls, otherwisee show the MAX of the biggest number in that columnI tried this: =IIF(Max(Fields!pccount.Value) >= 1, Max(Fields!pccount.Value),"NONE ")But it displays NULL when I run my report... Any ideas what the correct format is off this please?Thanks,