Conditional Conditons in SQL Server

Question

I have a combobox with 3 values: All, Failed, Completed.

ALL: load All rows and no condition. Failed and

Answer 1

DECLARE @status varchar(15)

--set the status

SELECT * 
FROM tbl_Location
WHERE Status = @status OR @status = 'ALL'

Answer 2

Make your combo-box to send a parameter call @status. Send @status = null when you need to load all row.

Select *
from tbl_location
where @status is null or status = @status;