我想用ASP.Net实现数据在页面上的图表显示。(棒图和曲线图)

给你一个思路:
    namespace TrxControlNS {
    using System;
    using System.Collections;
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;
    using System.Drawing;
    using System.Drawing.Imaging;    public class DrawLineChart{
        int[] xArray = null;
        int[] yArray = null;        public int[] X{
            get{
                return xArray;
            }
            set{
                xArray = value;
            }
        }
        public int[] Y{
            get{
                return yArray;
            }
            set{
                yArray = value;
            }
        }
        public DrawLineChart() {
        }        
        public DrawLineChart(int[] X,int[] Y) {
            xArray = X;
            yArray = Y;
        }
        public Bitmap DrawLineMethod(){
            int width = 300;
            int height = 200;
            Bitmap bitmap = new Bitmap(width,height);
            Graphics graphics = Graphics.FromImage( bitmap );
            graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            SolidBrush brush = new SolidBrush(Color.LightYellow);
            
            graphics.FillRectangle(brush,0,0,width,height);//fill into a white rectangle;
            Point[] point = new Point[ X.Length ];
            for(int i=0;i< point.Length;i++){
                int xInt = X[i];
                int yInt = height - Y[i] ;
                point[i] = new Point( xInt,yInt );
            }
            Pen pen = new Pen(Color.Red);
            
            for(int i=0;i< point.Length-1;i++){
                pen.Color = Color.Red;
                pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;
                graphics.DrawLine(pen, point[i],point[i+1]);                pen.Color = Color.LightGray;
                pen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
                graphics.DrawLine(pen, new Point(0,point[i+1].Y) ,point[i+1]);
                brush.Color = Color.Blue;   
                graphics.DrawString( (height - point[i].Y).ToString(),new Font("verdana",8),brush,Convert.ToSingle( point[i].X + 3 ),Convert.ToSingle( point[i].Y - 3 ) );
                if( i == point.Length-1-1 ){
                     graphics.DrawString( (height - point[i+1].Y).ToString(),new Font("verdana",8),brush,Convert.ToSingle( point[i+1].X + 3 ),Convert.ToSingle( point[i+1].Y - 3 ) );
                }
            }
            return bitmap;
        }
    }
}