Hi Ganesh,
You can refer the following links for connecting Crystal reports with dashboards:
Dashboard integration in Crystal Reports using flash variables | Clariba Blog
https://websmp102.sapag.de/~sapidp/011000358700001426732009E/Xcelsius_EmbeddingInCR2008.pdf
http://events.asug.com/2012BOUC/0315_Integrating_SAP_Dashboards_into_SAP_Crystal_Reports.pdf
Regards,
Renu