private void button1_Click(object sender, EventArgs e)
{ 
//上面是一段对数据库的其他操作
form1.drawBanpi1();
}

private void drawSquare(Graphics graphic, Pen pen, int x, int y, int Wide, int hight)
 {
      graphic.DrawRectangle(pen, x, y, Wide, hight);
  }

public void drawBanpi1()
        {
            for (int i = 115; i <= 115 + 20 * (dataGridView2.Rows.Count - 2); i += 20)
            {
                square = setSquare(65, i, 200, 10);
                drawSquare(this.CreateGraphics(), Pens.Black, square.Square_X, square.Square_Y, square.Square_Wide, square.Square_Hight);
            }
        }