Fetching a particular record in Report Viewer

Hello Everyone,

I am Sameer working on window's based application on vb.net using SQLSERVER 2005 EXPRESS EDITION.
Am developing a Stand Alone S/W for a small Clinic.
The problem is in Reports.

I am using Report Viewer to generate reports.
It's fine if i have to take reports of all the data present in the data base.:)
The problem is how to take reports of particular record.:cry:
I dont know how to pass query to Report Viewer.:(
So if any one out there know anything about this Please reply

Thankyou.