Print out a column value only if another column has a specific value (CASE Statement)

Hello all,
I tried many hours to find a solution for the following request but wasn't successful. Maybe you could help me.
I've using the already existing SQL Views in Microsoft Service Manager to do some basic reporting about my tickets.There is no closed date in the activity tickets so I decided to print out the lastmodified timestamp when the status is "closed".
That's my query:
SELECT DISTINCT
dbo.DisplayStringView.DisplayName AS Status,
CASE WHEN dbo.DisplayStringView.DisplayName = 'Closed' THEN dbo.DisplayStringView.LastModified ELSE 'NO CLOSED Date' END AS ClosedDate
FROM dbo.MTV_System$WorkItem$Activity$ManualActivity LEFT OUTER JOIN
dbo.DisplayStringView ON dbo.MTV_System$WorkItem$Activity$ManualActivity.Status_8895EC8D_2CBF_0D9D_E8EC_524DEFA00014 = dbo.DisplayStringView.LTStringId
Unfortunatelly I'm not getting the value from dbo.DisplayStringView.LastModified. SQL outputs that it is not possible to convert the string to date/time.
I think there is a problem with the CASE statement in combination with a value select.
Any ideas how to print out a column value only if another column has a specific value?

I think it is the other way if you want the missing date shown as a string.
CASE
WHEN
dbo.DisplayStringView.DisplayName
=
'Closed'
THEN
Convert( varchar(10),dbo.DisplayStringView.LastModified
, 101) ELSE
'NO CLOSED Date'
END
AS
ClosedDate

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Message was edited by:
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