private void frmPhieuXuat_Load(object sender, EventArgs e) { KhoaDieuKhien(); cboCotTK.Text = "Mã Phiếu Xuất"; HienThiDuLieu(""); //lay tt nv cboMaNV.DataSource = bll.LayThongTinNV(""); cboMaNV.ValueMember = "MaNV"; cboMaNV.DisplayMember = "MaNV"; //lay tt kh cboMaKH.DataSource = bll.LayThongTinKH(""); cboMaKH.ValueMember = "MaKH"; cboMaKH.DisplayMember = "MaKH"; }