exporter dundas chart en format pdf

Code:

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  //create an instance of the reportviewer
            Microsoft.Reporting.WebForms.ReportViewer exporter = new Microsoft.Reporting.WebForms.ReportViewer();
 
            //set the local report to the reportName
            exporter.LocalReport.ReportPath = reportName;
 
            //create the parameters to pass to the Report and then pass it
            List<ReportParameter> paramList = new List<ReportParameter>();
            string imageString = ImageToString(imageFileName);
            paramList.Add(new ReportParameter("StringImage",imageString,true));
            exporter.LocalReport.SetParameters(paramList);

j'ai un probleme au niveau du reportviewer.LocalReport.SetParameters??!!ca passe pas :(