==============SERVICE=========================

A_DAL A = new A_DAL();

        void Add(Entites h)

        {

            A.Them(h.MA, h.TEN);

        }

        public void Add(int a, string b)

        {

            Entites h2 = new Entites();

            h2.MA = a;

            h2.TEN = b;

            Add(h2);

        }

===============DAL_LOGIC======================

public void Them(int a, string b)

        {

            SqlParameter[] p;

            p = new SqlParameter[2];

            p[0] = new SqlParameter("Ma", a);

            p[0].SqlDbType = SqlDbType.Int;

            p[1] = new SqlParameter("Ten", b);

            p[1].SqlDbType = SqlDbType.NVarChar;

            h.ExecuteNonQuerry("Them", p);

        }

public int Layma()

        {

            return h.GetValueInt("LayMaNV");

        }

=====================HELPER===================

   public int GetValueInt(string proc)

        {

            cmd = new SqlCommand();

            cmd.CommandText = proc;

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Connection = p.Connect();

            int i = int.Parse(cmd.ExecuteScalar().ToString());

            return i;

        }

  public void ExecuteNonQuerry(string proc, SqlParameter[] param)

        {

            cmd = new SqlCommand();

            cmd.CommandText = proc;

            cmd.CommandType = CommandType.StoredProcedure;

            cmd.Parameters.AddRange(param);

            cmd.Connection = p.Connect();

            cmd.ExecuteNonQuery();

        }

==============MAIN=============

private void btnThem_Click(object sender, EventArgs e)

        {

            s.Them(int.Parse(txtManv.Text), txtTennv.Text, cboGioitinh.Text, mkngaysinh.Text, txtDiachi.Text, mkNgaylam.Text);

            dgvNhanvien.DataSource = s.LoadDataGridView();

            MessageBox.Show("Thêm thành công", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Information);

            Moi();

        }