protected void BtnRefresh_Click(object sender, EventArgs e)
    {
        //check object session
        LoginSessionData.IsValid();

        //Hide the display panel
        DisplayMessage.Visible = false;

        //add a try catch block here
        try
        {

            ReportViewer1.LocalReport.Refresh();
        }
        catch (Exception ex)
        {
            m_logger.Error(ex);
        }
    }

ReportParameter p1 = new
      ReportParameter("ShowDescriptions", checkBox1.Checked.ToString());
ReportParameter p2 = new
      ReportParameter("MyDate", DateTime.Now.ToString());
ReportViewer1.LocalReport.SetParameters(new ReportParameter[] { p1, p2 });