private void ch_enerjiler(string tarih)
        {
            htmlTable.Clear();
            List <Enerjiler> enerjiler = new List <Enerjiler>();

            enerjiler = db.enerjiler_data_read(tarih, firma, unite);
            if (enerjiler[0].Enerji_id == 0)
            {
                //kayit bulunamadi
                htmlTable.Append("<tr>");
                htmlTable.Append("<td colspan='7'>" + enerjiler[0].Enerji_bilgitnm + "</td>");
                htmlTable.Append("</tr>");
            }
            else
            {
                foreach (var e in enerjiler)
                {
                    htmlTable.Append("<tr>");
                    htmlTable.Append("<td>" + e.Enerji_bilgitnm + "</td>");
                    htmlTable.Append("<td>" + e.Gun_kwh + "</td>");
                    htmlTable.Append("<td>" + e.Gun_kwh_ton + "</td>");
                    htmlTable.Append("<td>" + e.Ay_kwh + "</td>");
                    htmlTable.Append("<td>" + e.Ay_kwh_ton + "</td>");
                    htmlTable.Append("<td>" + e.Yil_kwh + "</td>");
                    htmlTable.Append("<td>" + e.Yil_kwh_ton + "</td>");
                    htmlTable.Append("</tr>");
                }
            }

            ph_enerjiler.Controls.Add(new Literal {
                Text = htmlTable.ToString()
            });
        }