You could call a report via URL access and pass the parameter to the URL.
Refer to
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/RSPROG/htm/rsp_prog_urlaccess_2v74.asp
for details.

--
Ravi Mumulla (Microsoft)
SQL Server Reporting Services

This posting is provided "AS IS" with no warranties, and confers no rights.
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Dear Sir,
How can reporting servicing receive parameter from Asp.net program?