Reportviewer rdlc .net parameters

1)I am adding paarmeters to reportviewer.

Code: 2 ways -both giving smae error
        private void setRepParam()
        {
            ReportParameter[] RptParameters = new Microsoft.Reporting.WinForms.ReportParameter[2];//declare the number of parameters
            string strTrxx = ddTrxx.SelectedItem.ToString();
            string strYear = ddYear.SelectedItem.ToString();
            RptParameters[0] = new Microsoft.Reporting.WinForms.ReportParameter("YEAR", strYear,false);// first parameter
            RptParameters[1] = new Microsoft.Reporting.WinForms.ReportParameter("TR_XX", strTrxx,false);//second parameter
            try
            {
            this.reportViewer1.LocalReport.SetParameters(RptParameters);
            this.reportViewer1.LocalReport.Refresh();
            this.reportViewer1.Show();
            this.reportViewer1.RefreshReport();
            }
            catch (Exception e)
            {
                throw (e);    
            }
          }
        private void SetReportParameters()
        {
            string strTrxx = ddTrxx.SelectedItem.ToString();
            string strYear = ddYear.SelectedItem.ToString();
           
            ReportParameter yearParameter = new ReportParameter("Year",strYear);
            ReportParameter trGrpParameter = new ReportParameter("Trade_Owner", strTrxx);
            this.reportViewer1.LocalReport.SetParameters(new ReportParameter[] { yearParameter, trGrpParameter });
        }
2)Did select rdlc report and add parameters to it through the builder.
3)But still --
If I add this --this.reportViewer1.LocalReport.Refresh(); no report appears
If I write --this reportViewer1.ReportRefresh()---original report appears without any filter based on parameter..
How do I make parameterized reports run ?????