peace be with you

i try to write to " RecordSelectionFormula " like this :

ex:
Code:
report.RecordSelectionFormula = "{tests.test_res1}='" + report_for + "'
-- this Formula bring me all data that "" = "" to report_for

***when i add this code for the Formula like this
ex :
Code:
report.RecordSelectionFormula = "{tests.test_res1}='" + report_for + "'"
            report.RecordSelectionFormula = "{tests.test_date_med_wig}='#01/07/2006#'"
and error raise said (("" date-time is required here "" ))

how i can made a Formula to get the data that equal to special date ????