private void frmLapPhieuDat_Load(object sender, EventArgs e)
 {
     cboNCC.DataSource              = NhaCungCapBUS.DanhSachNCC();
     cboNCC.DisplayMember           = "TenNhaCungCap";
     cboNCC.ValueMember             = "MaNhaCungCap";
     dgvDanhSach.AllowUserToAddRows = false;
     dtkNgayDat.Value = DateTime.Now;
     dgvDanhSach.Rows.Clear();
 }