WinForm绘制带有升序、降序的柱形图

 private void HuiZhiTu( string strPaiXu)
        {
            //初始数据
            int[] nums = { 150, 89, 200, 60, 70, 90 };
            if (strPaiXu == "升序")
            {
                //冒泡排序
                for (int i = 0; i < nums.Length; i++)
                {
                    for (int j = 0; j < nums.Length-1; j++)
                    {
                        if (nums[i] > nums[j])
                        {
                            int temp = nums[i];
                            nums[i] = nums[j];
                            nums[j] = temp;
                        }
                    }
                }
                
            }
            else if (strPaiXu == "降序")
            {
                //冒泡排序
                for (int i = 0; i < nums.Length; i++)
                {
                    for (int j = 0; j < nums.Length-1; j++)
                    {
                        if (nums[i] < nums[j])
                        {
                            int temp = nums[i];
                            nums[i] = nums[j];
                            nums[j] = temp;
                        }
                    }
                }
            }
            else
            {
                //正常的顺序
            }
            label1.Text = strPaiXu;
            //创建画布
            int panHeight = this.panel1.Height;
            int panWight = this.panel1.Width;
            Bitmap bitM = new Bitmap(panWight, panHeight);
            Graphics g = Graphics.FromImage(bitM);
            g.Clear(Color.White);
            //绘制横向线条

            for (int i = 0; i < 5; i++)
            {
                g.DrawString(i * 50 + "", new Font("宋体", 10, FontStyle.Regular), new SolidBrush(Color.Black), 20, 50 * (5 - i) - 7);
                g.DrawLine(new Pen(Color.Red), 50, 50 * i + 50, 500, 50 * i + 50);
            }
            //绘制纵向线条
            g.DrawLine(new Pen(Color.Red), 50, 0, 50, 250);

            //填充数据
            for (int i = 0; i < nums.Length; i++)
            {
                g.FillRectangle(new SolidBrush(Color.Red), 50 * i + 80, 250 - nums[i], 40, nums[i]);
            }


            this.panel1.BackgroundImage = bitM;
        }

        private void btn_HuiZhi_Click(object sender, EventArgs e)
        {
            HuiZhiTu("正常顺序");
        }

        private void btn_ShengXu_Click(object sender, EventArgs e)
        {
            HuiZhiTu("升序");
        }

        private void btn_JiangXu_Click(object sender, EventArgs e)
        {
            HuiZhiTu("降序");
        }