private void btnThemDV_Click(object sender, EventArgs e)
{
eDichVu newdv = new eDichVu();
newdv.MaDV = txtMaDV.Text.Trim();
newdv.TenDV = txtTenDV.Text;
newdv.DonGia = Convert.ToInt32(txtDonGia.Text);
newdv.SoLuong = Convert.ToInt32(txtSL.Text);
int kq = dvBUS.InsertDichVu(newdv);
if (kq == 1)
{
MessageBox.Show("Thêm thành công!!!");
}
List <eDichVu> listDichVu = dvBUS.getalldv();
gridControlDV.DataSource = listDichVu;
}