图表不是我想像中的那样,比率画不出来,提取数据有也有点问题

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.Data.SqlClient;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Reflection;

public partial class _Default : System.Web.UI.Page
{

   string[] Mon = new string[12];
   int[] Number = new int[12];
    private void getInfo()
   {
     string myConnectionString    = "server=B11BF8375873411SQLEXPRESS;DataBase=months;uid=sa;pwd=456000;";
        SqlConnection myconnection = new SqlConnection(myConnectionString);
      string cmdString = "select mon,number from month order by mon ";
        myconnection.Open();
        SqlCommand mycommand = new SqlCommand(cmdString, myconnection);
       SqlDataReader myReader = mycommand.ExecuteReader();
        int index = 0;
       while (myReader.Read())
        {
            Mon[index] = Convert.ToString (myReader.GetSqlInt32(0))+"月" ;
           Number[index] = (int)myReader.GetSqlInt32(1);
        }
       myconnection.Close();
   }
    private Color GetColor(int i)
    {
        Color myColor;
        switch (i)
        {
            case 0:
                myColor = Color.Cornsilk;
                return myColor;

            case 1:
                myColor = Color.Red;
                return myColor;

            case 2:
                myColor = Color.Yellow ;
                return myColor;

            case 3:
                myColor = Color.Peru;
                return myColor;

            case 4:
                myColor = Color.AliceBlue ;
                return myColor;

            case 5:
                myColor = Color.Bisque ;
                return myColor;

            case 6:
                myColor = Color.Gray ;
                return myColor;

            case 7:
                myColor = Color.Maroon ;
                return myColor;

            case 8:
                myColor = Color.Azure ;
                return myColor;

            case 9:
                myColor = Color.Orange ;
                return myColor;

            case 10:
                myColor = Color.Coral ;
                return myColor;
            case 11:
                myColor = Color.BurlyWood ;
                return myColor;
            default :
                myColor = Color.Green;
                return myColor;

        }
    }
    private void CarryOutPic()
    {
        Bitmap myImage = new Bitmap(600, 300);
        Graphics myG = Graphics.FromImage(myImage);
        myG.Clear(Color.White);
        myG.DrawString("XX公司XX产品2007年销售情况一看表", new System.Drawing.Font("宋体",15), Brushes.Black, new Point(5, 5));
        Point myRec = new Point(515, 30);
        Point myDec = new Point(540, 30);
        Point myTxt = new Point(565, 30);
        myG.DrawString("单位:万件", new Font("宋体",9), Brushes.Black, new Point(512, 12));
        for (int i = 0; i < Mon.Length; i++)
        {
            myG.FillRectangle(new SolidBrush(GetColor(i)), myRec.X, myRec.Y, 20, 10);
            myG.DrawRectangle(Pens.Black, myRec.X, myRec.Y, 20, 10);
            myG.DrawString(Convert.ToString(Mon[i]), new Font("宋体", 9), Brushes.Black, myDec);
            myG.DrawString(Convert.ToString(Number[i]), new Font("宋体", 9), Brushes.Black, myTxt);
            myRec.Y += 15;
            myDec.Y += 15;
            myTxt.Y += 15;
        }
        int Total = 0;
        float CurrentAngle = 0;
        float StartAngle = 0;
        for (int i = 0; i < Number.Length; i++)
        {
            Total += Number[i];
        }
        for (int i = 0; i < Number.Length; i++)
        {
            if (i == Number.Length - 1)
            {
                CurrentAngle = 360 - StartAngle;
            }
            else
            {
                int Temple=Number[i];
                 StartAngle =(Temple*360)/Total ;
            }
            myG.DrawPie(Pens.Black ,100,40,250,250,StartAngle ,CurrentAngle );
            myG.FillPie (new SolidBrush(GetColor (i)),100,40,250,250,StartAngle ,CurrentAngle );
            StartAngle +=CurrentAngle ;
        }
        Pen myPen=new Pen(Color.Black ,2);
        myG.DrawRectangle (myPen ,1,1,598,298);
        myImage.Save (Response .OutputStream,System.Drawing .Imaging .ImageFormat .Gif );
        myImage .Dispose();
        myG.Dispose ();
        myPen.Dispose ();
    }

    protected void Page_Load(object sender, EventArgs e)
    {
       getInfo();
      CarryOutPic();
    }
}
--------------------编程问答-------------------- flex+.net 画图很舒服

补充：.NET技术 ,  ASP.NET