Need help with SQL query using CASE

I have this query:

SELECT      StartDateTime, EndDateTime =
                  CASE EndDateTime
                        WHEN NULL THEN GETDATE()
                        ELSE EndDateTime
                  END
FROM         tblServiceRequest_Time

When the field is NULL I want the result to include the current date/time for the EndDateTime field.  It isn't working and still returns NULL.  Can someone clue me in to the problem?
DanLockwoodAsked:
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Éric MoreauSenior .Net ConsultantCommented:
no need for a CASE in this scenario:

SELECT      StartDateTime, isnull(EndDateTime, GetDate()) AS EndDateTime
FROM         tblServiceRequest_Time

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DanLockwoodAuthor Commented:
Perfect thanks!
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Microsoft SQL Server 2008

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