private void Form1_Load(object sender, EventArgs e)
        {
///这里应该怎么调用，怎么样写！请各位帮忙！俺是菜鸟！   
        }



 public Image Render(string title, int width, int height, DataTable chartTable)
        {
            Bitmap bm = new Bitmap(width,height);

            Graphics g = Graphics.FromImage(bm);
            g.Clear(Color.White);

            const int top = 30;
            const int left = 35;
            if (width < left * 2 || height < top * 2)
            {
                g.DrawString("绘画区域太小",new Font("Tahoma",8),Brushes.Red,new PointF(0,0));
                return bm;
            }
            if (chartTable == null)
            {
                g.DrawString("没有数据",new Font("Tahoma",7),Brushes.Blue,new PointF(0,0));
                return bm;
            }

            DataTable dt = chartTable;
            //计算最高点
            float highPoint = 1;
            foreach (DataRow dr in dt.Rows)
            {
                if (highPoint <float.Parse(Convert.ToString(dr[0])))
                {
                    highPoint = float.Parse(Convert.ToString(dr[0]));
                }
                //if (highPoint < float.Parse(Convert.ToString(dr[1])))
                //{
                //    highPoint = float.Parse(Convert.ToString(dr[1]));
                //}
            }
            try
            {
                //画大标题
                g.DrawString(title, new Font("Tahoma", 12), Brushes.Black, new PointF(2, 2));
                StringFormat drawFormat = new StringFormat();
                drawFormat.FormatFlags = StringFormatFlags.DirectionVertical;

                g.DrawString("红--" + dt.Columns[0].ToString() + "]", new Font("Tahoma", 8), Brushes.Red, new PointF(2, top), drawFormat);

                //画条形图
                float barWidth = (float.Parse(Convert.ToString(width)) - left) / (dt.Rows.Count + 1);
                PointF barOrigin = new PointF(left + barWidth, 0);
                float barHeigh = dt.Rows.Count;
                float topFontSize = 7;
                float bottomFontSize = 7;

                PointF[] pt1 = new PointF[dt.Rows.Count];
                PointF[] pt2 = new PointF[dt.Rows.Count];

                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    //底部字体大小
                    barHeigh =int.Parse(Convert.ToString(dt.Rows[i][0])) * (height - 2 * top) / highPoint * 1;

                    barOrigin.Y = height - barHeigh - top;

                    g.FillEllipse(new SolidBrush(Color.Red), barOrigin.X - 3, barOrigin.Y - 3, 6, 6);

                    pt1[i] = new PointF(barOrigin.X, barOrigin.Y);

                    g.DrawString(dt.Rows[i][0].ToString(), new Font("Tahoma", topFontSize), Brushes.Red, new PointF(barOrigin.X, barOrigin.Y - 4 * topFontSize / 2));

                    barHeigh =int.Parse(Convert.ToString(dt.Rows[i][1])) * (height - 2 * top) / highPoint * 1;

                    barOrigin.Y = height - barHeigh - top;

                    g.FillEllipse(new SolidBrush(Color.Blue), barOrigin.X - 3, barOrigin.Y - 3, 6, 6);

                    pt2[i] = new PointF(barOrigin.X, barOrigin.Y);

                    //顶部
                    g.DrawString(dt.Rows[i][1].ToString(), new Font("Tahoma", topFontSize), Brushes.Blue, new PointF(barOrigin.X, barOrigin.Y - 4 * topFontSize / 2));

                    barOrigin.X = barOrigin.X + barWidth;
                }
                if (dt.Rows.Count > 10)
                {
                    int dis = dt.Rows.Count / 10;
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        if (i % dis == 0)