我把代码放在pictureBox的Paint事件里面 不能显示出图来
        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {            System.Drawing.Graphics formGraphics = this.CreateGraphics();
            string drawString = "Text";
            System.Drawing.Font drawFont = new System.Drawing.Font("Arial", 16);
            System.Drawing.SolidBrush drawBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Black);
            float x = 250.0f;
            float y = 200.0f;
            System.Drawing.StringFormat drawFormat = new System.Drawing.StringFormat(StringFormatFlags.DirectionVertical);//文本
            formGraphics.DrawString(drawString, drawFont, drawBrush, x, y);//绘制文本        }