ผมจาก ID 088812 ครับ อยากให้พี่ๆช่วยหน่อยครับผม ติดปัญหาตรง cmdBuider.GetUpdateCommand();

private void button3_Click(object sender, EventArgs e)
        {
            DialogResult strAnswer;
            strAnswer = MessageBox.Show("ท่านต้องการลบข้อมูลรายการนี้จริงหรือไม่",
                "ยืนยันการลบข้อมูล", MessageBoxButtons.OKCancel,
                MessageBoxIcon.Question);
            if (strAnswer == DialogResult.OK)
            {
                string conStr = "Data Source = BIGGEST-PC;Initial Catalog =sale;User = user1; Password =1234;";
                SqlConnection conn = new SqlConnection();
                conn.ConnectionString = conStr;
                conn.Open();

                SqlCommand comm = new SqlCommand();
                comm.Connection = conn;
                comm.CommandText = "Select * From Customers Where CustomerID = @CusID";
                comm.Parameters.Add("@CusID", SqlDbType.VarChar).Value = textBox1.Text;
                
                SqlDataAdapter dap = new SqlDataAdapter();
                dap.SelectCommand = comm;
                DataSet ds = new DataSet();
                dap.Fill(ds, "cus");

                DataTable dt = ds.Tables["cus"];
                dt.Rows[0].Delete();
                
                SqlCommandBuilder cmdBuider = new SqlCommandBuilder(dap);
                cmdBuider.GetUpdateCommand();
                dap.Update(ds, "cus");
                ds.Clear();

                comm.CommandText = "Select * From Customers";
                dap.SelectCommand = comm;
                dap.Fill(ds, "cus");

                dataGridView1.DataSource = ds;
                dataGridView1.DataMember = "cus";

                textBox1.Clear();
                textBox2.Clear();
                textBox3.Clear();
                conn.Close();
            }
        }