问Paint事件持续触发

EN

Rectangle[,] rec = new Rectangle[6,6];
Label label_1 = new Label();
Label label_2 = new Label();

public Reversi()
        {
            ClientSize = new Size(500,425);
            BackColor = Color.DarkGreen;
            NewGame();
            Paint += DrawGrid;
        }

public void NewGame()
        {
            // here is some more stuff which I will leave out for the sake of clarity
            for (int i = 0; i < grspel; i++)
            {
                for (int j = 0; j < grspel; j++)
                {
                    rec[i, j] = new Rectangle(50 + i * 50, 100 + j * 50, 50, 50);
                }
            }
            DrawLabels();
        }

public void DrawLabels()
        {
            label_1.Location = new Point(20, 50);
            label_1.Text = "Zwart: " + zwart;
            Controls.Add(label_1);

            label_2.Location = new Point(330, 50);
            label_2.Text = "Wit: " + wit;
            Controls.Add(label_2);
        }

public void DrawGrid(object o, PaintEventArgs pea)
        {
            MessageBox.Show("test");
            for (int i = 0; i < 6; i++)
            {
                for (int j = 0; j < 6; j++)
                {
                    pea.Graphics.DrawRectangle(new Pen(Brushes.Black), rec[i,j]);
                }
            }
        }