// pic a picture box
            Bitmap bm = new Bitmap(pic.Width, pic.Height);
             g = Graphics.FromImage(bm);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量插值法
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;//设置高质量,低速度呈现平滑程度
            Pen p = new Pen(Brushes.Black, 2F);
            g.Clear(System.Drawing.Color.AliceBlue);
            try
            {
                int row = dgvtest.Rows.Count;//从datagridview 中取数据
                if (row == 0)
                {
                    //g.DrawString("没有可供分析的数据……", new Font("宋体", 17), Brushes.Maroon, new PointF(pic.Location.X + 100, pic.Location.Y + 30));
                }
                else
                {
                    // x Axis
                    g.DrawLine(p, pic.Location.X + 30, pic.Location.Y + pic.Height - 40, pic.Width - 40, pic.Location.Y + pic.Height - 40);
                    // Y Axis
                    g.DrawLine(p, pic.Location.X + 30, pic.Location.Y + pic.Height - 40, pic.Location.X + 30, pic.Location.Y + 30);

                    // g.DrawLine(Pens.DarkGray, pic.Location.X + 30, pic.Location.Y + 30, pic.Width - 40, pic.Location.Y + 30);
                    // Y Axis
                    // g.DrawLine(Pens.DarkGray, pic.Width - 40, pic.Location.Y + pic.Height - 40, pic.Width - 40, pic.Location.Y + 30);

                    //原点
                   // g.DrawString("0", new Font("宋体", 9), Brushes.Black, new PointF(pic.Location.X + 25, pic.Location.Y + pic.Height - 38));

                    g.DrawString("产量(件)", new Font("宋体", 10), Brushes.Maroon, new PointF(pic.Location.X + 10, pic.Location.Y + 15));

                    g.DrawString("工序", new Font("宋体", 10), Brushes.Maroon, new PointF(pic.Width - 60, pic.Location.Y + pic.Height - 30));

                    int[] IntMV = GetMaxArrayValueAndAvgValue();//datagridview 的一列

                    int maxvalue = IntMV[0];//一列的最大值
                    int avgvalue = IntMV[1];一列的平均值

                    for (int i = 0; i < 4; i++)
                    {
                        g.DrawLine(Pens.LightSlateGray, pic.Location.X + 30, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) / 4 * (i + 1), pic.Width - 40, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) / 4 * (i + 1));
                        g.DrawString(maxvalue / 4 * (i + 1) + "", new Font("宋体", 12), Brushes.Maroon, pic.Location.X, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) / 4 * (i + 1) - 5);
                    }

                    int scale = (pic.Width - 100 - pic.Location.X) / row;

                    for (int i = 0; i < row; i++)
                    {
                        if (i % 2 == 0)
                        {
                            Rectangle rec = new Rectangle(pic.Location.X + 30 + scale * i , pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue, scale, (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue);
                            LinearGradientBrush lb = new LinearGradientBrush(rec, Color.LightBlue, Color.Blue, LinearGradientMode.Horizontal);
                            g.FillRectangle(lb, rec);

                            g.DrawString(dgvtest[1, i].Value.ToString(), new Font("宋体", 9), Brushes.Blue, pic.Location.X + 30 + scale * i , pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue -10);

                            g.DrawLine(Pens.Black, pic.Location.X + 30 + scale * (i+1), pic.Location.Y + pic.Height - 44, pic.Location.X + 30 + (i+1) * scale, pic.Location.Y + pic.Height - 36);
                            g.DrawString(dgvtest[0, i].Value.ToString(), new Font("宋体", 9), Brushes.Blue, pic.Location.X + 30 + scale * i, pic.Location.Y + pic.Height - 35);
                            
                        }
                        else
                        {
                            Rectangle rec = new Rectangle(pic.Location.X + 30 + scale * i, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue, scale, (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue);
                            LinearGradientBrush lb = new LinearGradientBrush(rec, Color.LightBlue, Color.Blue, LinearGradientMode.Horizontal);
                            g.FillRectangle(lb, rec);

                            g.DrawString(dgvtest[1, i].Value.ToString(), new Font("宋体", 9), Brushes.Red, pic.Location.X + 30 + scale * i, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * Convert.ToInt32(dgvtest[1, i].Value) / maxvalue - 10);

                            g.DrawLine(Pens.Black, pic.Location.X + 30 + scale * (i+1), pic.Location.Y + pic.Height - 42, pic.Location.X + 30 + (i+1) * scale, pic.Location.Y + pic.Height - 38);
                            g.DrawString(dgvtest[0, i].Value.ToString(), new Font("宋体", 9), Brushes.Red, pic.Location.X + 30 + scale * i, pic.Location.Y + pic.Height - 35);

                        }
                    }
                  
                    //g.DrawLine(Pens.Red, pic.Location.X + 30, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * avgvalue / maxvalue, pic.Width - 40, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * avgvalue / maxvalue);

                    //g.DrawString(avgvalue + "", new Font("宋体", 12), Brushes.Red, pic.Location.X, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * avgvalue / maxvalue - 5);
                    //g.DrawString("AVG", new Font("宋体", 10), Brushes.Red, pic.Width - 40, pic.Location.Y + pic.Height - 40 - (pic.Height - 120) * avgvalue / maxvalue - 8);
                    // g.DrawImage(bm, 0, 0);
                }
            }
            catch
            { }

            pic.Image = (Image)bm;

------解决方案--------------------
建议用dundas，方便简单，快捷，漂亮，这里就不给例子了，搜一下，N多！

------解决方案--------------------
这里有个手把手教程
http://hi.baidu.com/%C8%FC%C4%C9%D0%D0%D0%C7/blog/item/dca89efb91d232136d22eb91.html

.net使用DotNetCharting控件生成报表统计图总结，效果超炫
http://www.cnblogs.com/dreamof/archive/2008/07/18/1245887.html


------解决方案--------------------
做饼图之类图表的工具多了去了，其中以dundas的图表最好看
但是还要考虑下只是展现，还是需要打印，这个重要的特性。

这里有个FusionCharts的代码例子
http://files.cnblogs.com/babyt/FusionChartsHelper.zip

解压后，用VS2005，打开网站，找到这个文件夹后就能跑起来了。效果还不错。

------解决方案--------------------

C# code
/// <summary>
        /// 将进度数据转换为图片形式,柱状图,折线图,饼状图,图形样式由参数决定
        /// \n绘制各款式完成量占总完成量比例图(饼状)
        /// </summary>
        /// <param name="title">图片标题</param>
        /// <param name="dataList">要展示的数据列表</param>
        /// <param name="unitStr">单位</param>
        /// <param name="width">图片宽</param>
        /// <param name="height">图片高,0为自适应</param>
        /// <returns></returns>
        public Image GetProgressDateImage(string title, IList<ProgressData> dataList, string unitStr, int width, int height)
        {
            if (dataList == null || dataList.Count == 0)
                return null;
            double total = 0.0;             //总数量            
            foreach (ProgressData progressData in dataList)
            {
                total += progressData.ItemValue;
            }
            if (total == 0)
                return null;
            int itemCount = dataList.Count;
            int bmHeight = 178; //进度图的初始高度
            if (height == 0)
            {
                for (int i = 9; i < itemCount; i++)
                    bmHeight += 15;
            }
            int changeWidh = 0;
            Bitmap bm = new Bitmap(width + 50, bmHeight);
            Graphics g;
            g = Graphics.FromImage(bm);
            changeWidh = Convert.ToInt32(g.MeasureString(dataList[0].ItemName, new Font("宋体", 9)).Width);
            g.Clear(System.Drawing.Color.Snow);
            g.DrawString(title, new Font("宋体", 10), Brushes.Black, new Point(15, 5));
            Point myRec = new Point(120, 35);
            Point myDec = new Point(130, 35);
            Point myTxt = new Point(132 + changeWidh, 35);
            Point myPercent = new Point(132 + changeWidh + 20, 35);
            g.DrawString("单位：件", new Font("宋体", 9), Brushes.Black, new Point(90, 20));
            g.DrawString("占总完成量比", new Font("宋体", 8), Brushes.Blue, new PointF(170, 20));
            for (int i = 0; i < itemCount; i++)
            {
                g.FillRectangle(new SolidBrush(OrderPublic.GetColor(i)), myRec.X, myRec.Y, 10, 10);
                //填充小方块
                g.DrawRectangle(Pens.Black, myRec.X, myRec.Y, 10, 10);
                //绘制小方块
                g.DrawString(dataList[i].ItemName, new Font("宋体", 9), Brushes.Black, myDec);
                //绘制小方块右边的文字
                g.DrawString(dataList[i].ItemValue.ToString(), new Font("宋体", 9), Brushes.Green, myTxt);
                string percent = Math.Round(dataList[i].ItemValue / total * 100, 2) + "%";
                g.DrawString(percent, new Font("宋体", 9), Brushes.Blue, myPercent);
                myRec.Y += 15;
                myDec.Y += 15;
                myTxt.Y += 15;
                myPercent.Y += 15;
            }

            //绘制扇型，并以相应色彩填充扇型,从而构成图Pie图              
            float fCurrentAngle = 0;
            float fStartAngle = 0;
            for (int i = 0; i < itemCount; i++)
            {
                //以下代码是获得要绘制扇型的开始角度
                if (i == itemCount - 1)
                {
                    fCurrentAngle = 360 - fStartAngle;
                }
                else
                {
                    try
                    {
                        fCurrentAngle = Convert.ToSingle((dataList[i].ItemValue * 360) / total);
                    }
                    catch { }
                }
                //根据参数绘制扇型
                g.DrawPie(Pens.Black, 10, 40, 105, 105, fStartAngle, fCurrentAngle);
                //以指定色彩填充绘制的扇型
                g.FillPie(new SolidBrush(OrderPublic.GetColor(i)), 10, 40, 105, 105, fStartAngle, fCurrentAngle);
                fStartAngle += fCurrentAngle;
            }

            //画出图片的边框
            Pen p = new Pen(System.Drawing.Color.Black, 2);
            g.DrawRectangle(p, 1, 1, width+changeWidh - 3, bmHeight - 2);
            return bm;
        }

------解决方案--------------------

C# code

 //绘图区背景颜色
            //oChartSpace.Charts[0].PlotArea.Interior.Color = "red";
            //绘图区
            // oChartSpace.Charts[0].PlotArea.Floor.Interior.Color = "green";

            oChartSpace.Charts[0].SeriesCollection.Add(0);
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection.Add();
            //柱状图颜色
            //oChartSpace.Charts[0].SeriesCollection[0].Interior.Color = "red";

            // ------------------------------------
            // If you're charting a pie or a variation thereof percentages make a lot
            // more sense than values...
            // ------------------------------------
            if (chartType == ChartChartTypeEnum.chChartTypePie ||
                chartType == ChartChartTypeEnum.chChartTypePie3D ||
                chartType == ChartChartTypeEnum.chChartTypeDoughnut)
            {
                oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].HasPercentage = true;
                oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].HasValue = false;
            }
                // ------------------------------------
                // Not so for other chart types where values have more meaning than
                // percentages.
                // ------------------------------------
            else
            {
                oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].HasPercentage = false;
                oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].HasValue = true;
            }

            // ------------------------------------
            // Plug your own visual bells and whistles here
            // ------------------------------------
            oChartSpace.Charts[0].SeriesCollection[0].Caption = String.Empty;
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Font.Name = "verdana";
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Font.Size = 10;
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Font.Bold = true;
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Font.Color = "red";
            oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Position = ChartDataLabelPositionEnum.chLabelPositionCenter;

            if (chartType == ChartChartTypeEnum.chChartTypeBarClustered ||
                chartType == ChartChartTypeEnum.chChartTypeBar3D ||
                chartType == ChartChartTypeEnum.chChartTypeColumnClustered ||
                chartType == ChartChartTypeEnum.chChartTypeColumn3D)
            {
                oChartSpace.Charts[0].SeriesCollection[0].DataLabelsCollection[0].Position = ChartDataLabelPositionEnum.chLabelPositionOutsideEnd;
            }

            oChartSpace.Charts[0].SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimCategories,
                Convert.ToInt32(OWC11.ChartSpecialDataSourcesEnum.chDataLiteral), chartCategoriesStr);

            oChartSpace.Charts[0].SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimValues,
                Convert.ToInt32(OWC11.ChartSpecialDataSourcesEnum.chDataLiteral), chartValuesStr);

            return oChartSpace;
        }

        #region  属性设置
        public string[] chartCategoriesArrValue
        {
            get
            {
                return chartCategoriesArr;
            }
            set
            {
                chartCategoriesArr = value;
            }
        }

        public string[] chartValuesArrValue
        {
            get
            {
                return chartValuesArr;
            }
            set
            {
                chartValuesArr = value;
            }
        }
        public string chartTypeValue
        {
            get
            {
                return chartTypeCh;
            }
            set
            {
                chartTypeCh = value;
            }
        }
        public string chartTitleValue
        {
            get
            {
                return chartTitle;
            }
            set
            {
                chartTitle = value;
            }
        }
        #endregion
    }

------解决方案--------------------

C# code

调用方法部分代码:
private void Form1_Load(object sender, System.EventArgs e)
        {
            try
            {
                                System.Threading.Thread thread=new System.Threading.Thread(new System.Threading.ThreadStart(aa));
                thread.Start();
                //ShowChart();
            }
            catch
            {}
            
        
        }

        void aa()
        {

            while(true)
            {
                ShowChart();
                System.Threading.Thread.Sleep(1000);
            }
        }

      //调用   首先需要在页面上放置一个pictureBox1来显示产生的统计图

        public void ShowChart()
        {
            try
            {
                string ConnString = "Data Source=SQL服务器地址;Initial Catalog=数据库名;Persist Security Info=True;User ID=用户名;Password=密码";
                DB.sqlDB db = new DB.sqlDB(ConnString);
                string sql = "查询字符串";
                DataTable table = db.getTable(sql);
                if (table != null && table.Rows.Count > 0)
                {

                    StringBuilder sb=new StringBuilder();
                    for (int i = 0; i < table.Rows.Count; i++)
                    {
                        if (i == 0)
                        {
                            sb.Append(table.Rows[i]["content"].ToString());
                        }
                        else
                        {
                            sb.Append("," + table.Rows[i]["content"].ToString());
                        }

                    }
                    string[] CategoriesArr ={sb.ToString()};

                    sb=new StringBuilder();


                    for (int i = 0; i < table.Rows.Count; i++)
                    {
                        if (i == 0)
                        {
                            sb.Append(table.Rows[i]["cnt"].ToString());
                        }
                        else
                        {
                            sb.Append("," + table.Rows[i]["cnt"].ToString());
                        }

                    }
                    string[] ValuesArr = { sb.ToString() };
              
                    ChartFactory chartFactory = new ChartFactory();
                    //初始化赋值
                    chartFactory.chartCategoriesArrValue = CategoriesArr;
                    chartFactory.chartValuesArrValue = ValuesArr;
                    chartFactory.chartTitleValue = "“龙源夜、网通情”欢送毕生晚会节目投票";//柱形图标注名称
                    chartFactory.chartTypeValue = "垂直柱状统计图";//图类型,在类中定义过

                    OWC11.ChartSpaceClass oChartSpace = chartFactory.BuildCharts();
                    string path = FileName;  //产生图片并保存 页可以是png gif图片

                    oChartSpace.ExportPicture(path, "jpeg", this.Width-100, this.Height-100);//后面是图片的宽和高
                
//下面使用    FileStream 对象的原因是本例使用线程.每秒重新生成一个图,并将原图覆盖.
//如果不使用 FileStream 将会出现共享冲突.        
                    FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read);
                    byte[] bytes = new byte[fs.Length];
                    fs.Read(bytes, 0, bytes.Length);
                    fs.Close();
                    MemoryStream ms = new MemoryStream(bytes);
                    
                
                    System.Drawing.Image img=System.Drawing.Image.FromStream(ms);
//本例使用pictureBox1显示图片
                    this.pictureBox1.Image=img;
                    this.pictureBox1.Refresh();
                

                }
            }
            catch(Exception e)
            { //MessageBox.Show(e.ToString()); 
            }
        
        }

------解决方案--------------------

C# code

//使用GDI画图，虽然比那些控件实现起来要麻烦些，但能看到原理。 

public partial class GDI画折线图_DrawImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataSet ds = GetData("哈哈");
            draw(this, ds);
        }
    }

    private DataSet GetData(string name)
    {
        using (SqlConnection conn = new SqlConnection("server=.;database=master;uid=sa;pwd=wsp"))
        {
            SqlCommand cmd = new SqlCommand("select * from Employees where name='" + name + "' order by month", conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
        }
    }

    //将dataset中的数据画在页面上
    public void draw(Page page, DataSet ds)
    {
        //取得记录数量
        int count = ds.Tables[0].Rows.Count;

        //生成Bitmap对象
        Bitmap img = new Bitmap(650, 600);
        //生成绘图对象
        Graphics g = Graphics.FromImage(img);
        //定义黑色画笔
        Pen Bp = new Pen(Color.Black);
        //定义红色画笔
        Pen Rp = new Pen(Color.Red);
        //定义银灰色画笔
        Pen Sp = new Pen(Color.Silver);
        //定义大标题字体
        Font Bfont = new Font("Arial", 12, FontStyle.Bold);
        //定义一般字体
        Font font = new Font("Arial", 8);
        //绘制底色
        g.Clear(Color.White);

        //定义黑色过渡型笔刷
        SolidBrush brush = new SolidBrush(Color.Black);
        //定义蓝色过渡型笔刷
        SolidBrush Bluebrush = new SolidBrush(Color.Blue);
        
        //绘制大标题
        g.DrawString(ds.Tables[0].Rows[0]["name"].ToString() + "的销售曲线图", Bfont, brush, 40, 5);
        //取得总销售量
        int nums = 0;
        for (int i = 0; i < count; i++)
        {
            nums += Convert.ToInt32(ds.Tables[0].Rows[i]["sale"]);
        }
        //绘制信息简报
        string info = "本年度总销售量：" + nums.ToString();
        g.DrawString(info, font, Bluebrush, 40, 25);
        //绘制图片边框
        g.DrawRectangle(Bp, 0, 0, img.Width - 1, img.Height - 1);

        //画X坐标(横坐标与月份的比例40：1)
        g.DrawLine(Sp, new Point(40, 500), new Point(520, 500));
        //绘制月份轴坐标标签
        for (int i = 0; i <= 12; i++)
        {
            //从40开始画起
            g.DrawString(i.ToString(), font, brush, 35 + 40 * i, 500);
            //画点（点之间Y坐标一致）
            g.DrawLine(Sp, new Point(40 + 40 * i, 500), new Point(40 + 40 * i, 497));
        }
        g.DrawString("时间（月）", font, brush, 550, 500);


        //画Y坐标(纵坐标与销售量的比例40：500)
        g.DrawLine(Sp, new Point(40, 500), new Point(40, 80));
        //绘制销售量轴坐标标签
        for (int i = 1; i <= 10; i++)
        {
            g.DrawString((i * 500).ToString(), font, brush, 10, 500 - (i * 40) - 5);
            //画点（点之间X坐标一致）
            g.DrawLine(Sp, new Point(40, 500 - (i * 40)), new Point(43, 500 - (i * 40)));
        }
        //绘制竖坐标标题
        g.DrawString("销售量（个）", font, brush, 10, 50);

        //根据点画折线图
        if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0)
        {
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                if (i == 0) //第一个点，起点从原坐标画起。
                {
                    int x = 40 + int.Parse(ds.Tables[0].Rows[0]["month"].ToString()) * 40;
                    //获取对应Y轴第几个点
                    int n = int.Parse((double.Parse(ds.Tables[0].Rows[0]["sale"].ToString()) / 500).ToString());
                    int y = 500 - (n * 40);
                    g.DrawLine(Rp, new Point(40, 500), new Point(x, y));
                }
                else
                {
                    //上个点的x、y坐标
                    int bx = 40 + int.Parse(ds.Tables[0].Rows[i-1]["month"].ToString()) * 40;
                    int bn = int.Parse((double.Parse(ds.Tables[0].Rows[i-1]["sale"].ToString()) / 500).ToString());
                    int by = 500 - (bn * 40);

                    //当前点的x、y坐标
                    int x = 40 + int.Parse(ds.Tables[0].Rows[i]["month"].ToString()) * 40;
                    int n = int.Parse((double.Parse(ds.Tables[0].Rows[i]["sale"].ToString()) / 500).ToString());
                    int y = 500 - (n * 40);
                    g.DrawLine(Rp, new Point(bx, by), new Point(x, y));
                }
            }
        }

        //保存绘制的图片
        MemoryStream stream = new MemoryStream();
        img.Save(stream, ImageFormat.Jpeg);
        //图片输出
        page.Response.Clear();
        page.Response.ContentType = "image/jpeg";
        page.Response.BinaryWrite(stream.ToArray());
    }
}

//数据库结构：
 CREATE TABLE [Employees] (  [id] [int] IDENTITY (1, 1) NOT NULL , [name] [varchar] (25) NOT NULL ,  [month] [int] NULL , [sale] [money] NOT NULL )

 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 1 , '哈哈' , 1 , 3000.0000 )
 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 2 , '哈哈' , 2 , 2000.0000 )
 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 3 , '哈哈' , 4 , 1500.0000 )
 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 4 , '哈哈' , 5 , 3500.0000 )
 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 5 , '哈哈' , 6 , 4000.0000 )
 INSERT [Employees] ( [id] , [name] , [month] , [sale] ) VALUES ( 6 , 'sdf' , 5 , 4000.0000 )
go