private void kiemTra() { AutoCompleteStringCollection AutoComp = new AutoCompleteStringCollection(); this.txtNhapMaHD.AutoCompleteMode = AutoCompleteMode.Suggest; this.txtNhapMaHD.AutoCompleteSource = AutoCompleteSource.CustomSource; if (frmMain.ktButtonClick == 10) { this.Text = "Quan Ly CTXH"; this.txtHocKy.Enabled = false; this.txtNamHoc.Enabled = false; this.ckbCoMat.Enabled = false; var lstMaHD = ctxhBUS.getMaHDCTXH(); foreach (var hd in lstMaHD) { AutoComp.Add(hd); } } else { this.Text = "Quan Ly HDRL"; var lstMaHD = rlBUS.getMaHDRL(); foreach (var hd in lstMaHD) { AutoComp.Add(hd); } } this.txtNhapMaHD.AutoCompleteCustomSource = AutoComp; }