mjtare 0 Newbie Poster

Hi,we have mirated database of an application from SQL 2000 to SQL 2005. Reports were being developed in SQL 2000 reporting services. So while migration we have converted into SQL 2005 -SSRS.It works fine. But previously they have used Report Viewer Control of 2000 reporting services. Now if I am trying to replace this with report viewer control of 2005,for thsi I have added reference
i.e.

"<%@ Register TagPrefix="cc1" Namespace="Microsoft.Reporting.WebForms" Assembly="Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"; %>" .

But it gives me error as
"File or assembly name "Microsoft.ReportViewer.WebForms,, or one of its dependencies, was not found.".
So can anybody please help me avoid this error.
thanks in advance.