Export report in CSV format in SSRS report through URL

Hi All,

I am using a url for my SSRS report to export in CSV format.

The problem is it is exporting correctly for the first time,But when i am selecting different parameters and after pressing the view report and exporting,it is giving me the same result.Can anyone tell me how to refersh it.

I am using the belowUrl

http:myserver/Pages/ReportViewer.aspx?%2fReport+test%2freport_name&rs:Command=Render&rs:Format=csv

while the result coming fine in my sub report.

Thanks in Advance

Regards,
Msbilearbning