How to pass parameter from Report Viewer Control to sub report?

How to pass parameter from Report Viewer 

Control to sub report?

Microsoft ReportViewer is the best alternative to Crystal Reports. In fact it is very easy to create RDLC report compare to crystal reports.

Here are some of the features in this source code:

1. Add subreport in addition to main report. Also called Parent and Child report.
2. Pass parameter from main report to subreport.
3. Use ID or the primary key of the main report to Fill DataSet of Subreport to speed up loading its loading time.
4. Load report programmatically.