public frm_muon_tra_sach() { InitializeComponent(); Utils.readOnly_text_box(new List <TextBox> { txt_ghichu }, true); Utils.enable_combobox(new List <ComboBox> { cbx_docgia, cbx_nhanvien }, false); chbox_xacnhantra.Enabled = false; dtgv_sachmuon.Enabled = false; dtpk_ngaymuon.Enabled = false; dtpk_ngaytra.Enabled = false; btn_xoa.Visible = false; btn_sua.Visible = false; DataGridViewComboBoxColumn data_sach = new DataGridViewComboBoxColumn(); data_sach.HeaderText = "Sách"; data_sach.Name = "data_sach"; sach_ctrl sach = new sach_ctrl(); var data_source = sach.select_all_sachview(); switch (data_source.errcode) { case ErrorCode.NaN: break; case ErrorCode.sucess: data_sach.DisplayMember = "tensach"; data_sach.ValueMember = "masach"; data_sach.DataSource = data_source.data; data_sach.FlatStyle = FlatStyle.Flat; break; case ErrorCode.fail: break; default: break; } dtgv_sachmuon.Columns.Add(data_sach); DataGridViewComboBoxColumn data_trangthai = new DataGridViewComboBoxColumn(); data_trangthai.HeaderText = "Trạng thái sách"; data_trangthai.Items.Add("Bình thường"); data_trangthai.Items.Add("Rách nát"); data_trangthai.Items.Add("Mất"); data_trangthai.FlatStyle = FlatStyle.Flat; dtgv_sachmuon.Columns.Add(data_trangthai); dtgv_sachmuon.Font = new Font("Verdana", 9, FontStyle.Regular); dtgv_sachmuon.Columns[1].Width = 150; dtgv_sachmuon.Columns[0].Width = 150; }