private void _DataBind() { if (cmbThang.Value == null && cmbNam.Value == null) { int thang = DateTime.Now.Month - 1; cmbThang.Value = thang; cmbNam.Value = DateTime.Now.Year; } MTCSYT.SYS_Session session = (MTCSYT.SYS_Session)Session["SYS_Session"]; float tt = float.Parse(TLTT_Tram.Text + ""); int Thang = int.Parse(cmbThang.Value + ""); int Nam = int.Parse(cmbNam.Value + ""); var dt = db.SELECT_TRAM_HATHE_CTT(cmMaDvi.Value + "", tt, Thang, Nam); cmbMaTram.DataSource = dt; cmbMaTram.ValueField = "MA_TRAM"; cmbMaTram.TextField = "STRTEN"; cmbMaTram.DataBind(); }