Q:

Passing parameter to ssrs report in query-string in SharePoint 2010

I published an ssrs to sharepoint and am trying to pass the value of parameter in the query string but I haven't been able to figure out the syntax.  Here is the query-string that I'm passing in.  I am trying to pass the CLordID = 1324381.  In my report CLordID

https:///_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/TestReports/Orders.rdl&rs:Command=Render&CLordID=1324381

When I try this I receive: 

Specify Parameter Values  Report
  parameter values must be specified
  before the report can be displayed.
  Choose parameter values in the
  parameters area and click the Apply
  button.

I have tried making the parameter, visible, hidden, and internal, but I haven't been able to get it to work.
Any help is greatly appreciated

A:

In SSRS 2008 with Sharepoint, you need to prefix each parameter passed in the URL with "rp:". 
For example: 
https:///_layouts/ReportServer/RSViewerPage.aspx?rv:RelativeReportUrl=/TestReports/Orders.rdl&rs:Command=Render&rp:CLordID=1324381

