ReportDocument objRpt = new RptPreviousMR();
objRpt.SetDatabaseLogon("sa", "12345", "RMISDB", cnn.Database.ToString());
               
objRpt.SetParameterValue("@p_date", Convert.ToDateTime(txtdate.Value));
objRpt.SetParameterValue("@p_date", Convert.ToDateTime(txtdate.Value), "RptPreviousMR_office.rpt");

crystalReportViewer1.ReportSource = objRpt;
crystalReportViewer1.Refresh();