SSRS 2005 textbox Nested iif problem in a expression

Hi All,

I am using an expression in a text box but nested iif doesnt work, here is the expression

=iif(Count(Fields!QDate.Value)= 0, "it is not in Datawarehouse yet",
  iif(Fields!QDate.Value <> Fields!SDate.Value ,"it may not be in Data Warehouse ,Please check dates", "it is in Data Warehouse"))

I am able to see second iif's result but dont see for the first iif which is " "it is not in Datawarehouse yet"

I am not using any expression for visibility

thanks

Gok