use ParameterDirection.Output and ParameterDirection.ReturnValue parameter, see
Using Stored Procedures with a Command
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconusingstoredprocedureswithcommand.asp
Using Stored Procedures with a Command
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconusingstoredprocedureswithcommand.asp
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