C#画折线图

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;
public partial class Default5 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.Pic();

    }
    private void Pic()
    {
        //测试数据
        DataTable table = new DataTable("Data");
        DataRow Dr;
        DataColumn Dc = new DataColumn("ID",Type.GetType("System.Int32"));
        DataColumn Dc2 = new DataColumn("Num",Type.GetType("System.Int32"));
        DataColumn Dc3 = new DataColumn("name", Type.GetType("System.String"));
        table.Columns.Add(Dc);
        table.Columns.Add(Dc2);
        table.Columns.Add(Dc3);
        Random rnd=new Random();
        for (int n = 0; n < 61; n++)
        {
            Dr = table.NewRow();
            Dr[0] = n;
            Dr[1] = rnd.Next(10, 140);
            Dr[2] = n.ToString();
            table.Rows.Add(Dr);
        }
        //画图参数
        int BG_Width = 450;
        int BG_Height = 180;
        int Pic_Width = 450;
        int Pic_Height = 180;
        int pic_X = 6;
        int pic_H = 1;
        int pic_tr=5;
        int pic_td = 12;
        Rectangle rec = new Rectangle(50, 15, 360, 150);
        Pen Pic_Bolder = new Pen(Color.Black, 1);
        Pen Pic_line = new Pen(Color.Gray, 1);
        Pen Pic_Data = new Pen(Color.Red,2);
        SolidBrush brusth = new SolidBrush(Color.Blue);
        Point[] DataPt = new Point[table.Rows.Count];
        int x;
        int y;
        for (int n = 0; n < table.Rows.Count; n++)
        {
            Dr=table.Rows[n];
            x=(int)Dr[0] * pic_X + rec.X;
            y=(int)Dr[1] * pic_H + rec.Y;
            DataPt[n] = new Point(x,y);
        }
        Bitmap Bg = new Bitmap(BG_Width, BG_Height, PixelFormat.Format24bppRgb);
        Graphics Ph = Graphics.FromImage(Bg);
        Ph.Clear(Color.White);      
        Ph.DrawRectangle(Pic_Bolder, rec);
        //画折线
        Ph.DrawCurve(Pic_Data, DataPt);
        //rec.
        Point SPoint=new Point();
        Point Epoint=new Point();
        //画横线
        for (int n = 1; n < pic_tr; n++)
        {
           //cell[0] = new Point(rec.X);
            SPoint.X = 0 + rec.X;
            SPoint.Y = n * 30 + rec.Y;
            Epoint.X = rec.Width + rec.X;
            Epoint.Y = n * 30 + rec.Y;
            Ph.DrawLine(Pic_line,SPoint,Epoint);
        }
        //画竖线
        for (int n = 1; n < pic_td; n++)
        {
            SPoint.X = n * 30 +rec.X;
            SPoint.Y = rec.Y;
            Epoint.X = n * 30 + rec.X;
            Epoint.Y = rec.Height+ rec.Y;
            Ph.DrawLine(Pic_line, SPoint, Epoint);
        }
        //画标题
        string Title = "画折线测试";       
        SolidBrush brush=new SolidBrush(Color.RoyalBlue);
        Ph.DrawString(Title, new Font("Franklin Gothic Demi", 12, FontStyle.Italic), brush, new Point(200, 0));
        Ph.Save();
        Bg.Save(Response.OutputStream, ImageFormat.Gif);
    }
}