SQL Server - Include NULL using UNPIVOT

UNPIVOT will not return NULLs, but I need them in a comparison query. I am trying to avoid using ISNULL the following example (Because in the real sql there are over 100 fields):

Select ID, theValue, column_name
From 
(select ID,
  ISNULL(CAST([TheColumnToCompare]  AS VarChar(1000)), '') as TheColumnToCompare
  from MyView
  where The_Date = '04/30/2009'
) MA
UNPIVOT
   (theValue FOR column_name IN 
   ([TheColumnToCompare])
) AS unpvt

Any alternatives?