using response object not work after the refresh

 Can someone help me regarding this issue. I have this code
                 if (ReportType == "Comparison")
                {
                    using (dbComparisonReports dbCom = new dbComparisonReports())
                    {
                        //if (dbCom.IsComparisonReportExist(ReportParameterKey) > 0)
                        //gvReportParameters.Attributes. ...