SQL CASE field WHEN NULL then... not returning data

In View SQL statement:

SELECT     TR_ID, TR_Name, TR_Qty, TR_CalcQty, CASE TR_Qty WHEN NULL THEN TR_CalcQty ELSE TR_Qty END AS New_Qty
FROM         dbo.tblTR

this doesn't recognise that records are null

How can I fix this?
DoozyAsked:
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amit_gCommented:
SELECT     TR_ID, TR_Name, TR_Qty, TR_CalcQty, IsNull(TR_Qty, TR_CalcQty) AS New_Qty
FROM         dbo.tblTR

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Dishan FernandoSoftware Engineer / DBACommented:
seazodiacCommented:
if you prefer your original query not to be changed:

try this before you run your query:

SET ANSI_NULLS OFF

go

OR

sp_db_options "<your_database_name>" , "ANSI nulls" , false
go
synakamrCommented:
Change:
SELECT     TR_ID, TR_Name, TR_Qty, TR_CalcQty, CASE TR_Qty WHEN NULL THEN TR_CalcQty ELSE TR_Qty END AS New_Qty
FROM         dbo.tblTR

To:
SELECT     TR_ID, TR_Name, TR_Qty, TR_CalcQty, CASE WHEN TR_Qty IS NULL THEN TR_CalcQty ELSE TR_Qty END AS New_Qty
FROM         dbo.tblTR

Detail:
CASE TR_Qty WHEN NULL
CASE WHEN TR_Qty IS NULL
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