Iif condition in total by descripion

I want o have my total by descripion based on the ISOrder value . If IsOrder = 1 then "Total " & Fields!ProjectName.Value & " by " & Fields!SuppNo.Value & " : "ELSE"Total " & Fields!ProjectName.Value & " test by " &Fields!SuppNo.Value & " (excluding charges) : ")I am using the condiion below, but it is not working :=Iif(Fields!IsOrder.Value, 1,"Total " & Fields!ProjectName.Value & " by " & Fields!SuppNo.Value & " : ","Total " & Fields!ProjectName.Value & " test by " &Fields!SuppNo.Value & " (excluding charges) : ")Please help!