LINQ Data type mismatch

Question

The following statement is in my stored procedure. In the LINQ designer, I am expecting that 'IsON' field to be mapped using datatype bool, but I get the data type as string in LINQ class. I tried 'True' and 1 also in the CASE statement but I am not getting the bool data type.

How can I get the data type in LINQ class as bool? Any other alternative to write the statement?

SELECT
   CASE
   WHEN DATEDIFF(DAY,GETUTCDATE(),T1.ExpiryDate) > 0 THEN 'true'
   ELSE 'false'
   END IsON
FROM myTable T1

Thanks in advance

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KDV