Sending parameters to Subreport in Crystal Reports

Hi,

I have two stored procedures, one used to get data for the main report and other for Sub report.I have send parameter to main report
using ReportDocument. But I am not aware how to send parameters to SubReport.

I tried many diff ways using the reportdocument's setparameter method which also takes subreport name as argument.But it didn't.

Can anyone let me know how to send params to Subreport.

Need code snippet in C#