public virtual CrystalDecisions.CrystalReports.Engine.ReportDocument CreateReport()
 {
     CR_orden_compra rpt = new CR_orden_compra();
     rpt.Site = this.Site;
     return rpt;
 }
        private void listar_almacen()
        {
            try
            {
                var listar_almacen = new CR_orden_compra();

                listar_almacen.DataDefinition.FormulaFields["empresaname"].Text = "'EMPRESA: " + VariablesPublicas.EmpresaName.Trim() + "'";
                listar_almacen.DataDefinition.FormulaFields["empresaruc"].Text = "'RUC: " + VariablesPublicas.EmpresaRuc.Trim() + "'";
                listar_almacen.DataDefinition.FormulaFields["anio"].Text = "'" + perianio.Trim() + "'";
                listar_almacen.DataDefinition.FormulaFields["inicio"].Text = "'" + VariablesPublicas.N_PrimerMes1.Trim() + "'";
                listar_almacen.DataDefinition.FormulaFields["fin"].Text = "'" + VariablesPublicas.N_FinMes1.Trim() + "'";

                if (igv == "0")
                {
                    listar_almacen.DataDefinition.FormulaFields["nameigv"].Text = "'No Incluye IGV'";
                }
                else
                {
                    listar_almacen.DataDefinition.FormulaFields["nameigv"].Text = "'Incluye IGV'";
                }
                listar_almacen.SetDataSource(Orden_Pendiente());
                crystalReportViewer1.ReportSource = listar_almacen;
                crystalReportViewer1.Show();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }