how to order a table by a field in crystal report

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ASP.NET

hi to all
i have a question of crystal report.
i have a report that fill from storedprocedure in database field in report
and i want to this report sort by fields for example by date that date is a field in my stored procedure.
i want to suppress date from code behind to report and define a forOrder formula that cantain same this line

if ({order="date"}) then sp_mystoredprocedure;1.Date

and my somthing like this
how can i do this?
my goal is sort datatable by some fields in crystal report that user can seleted this fields
thanks for any field