private ZedGraphControl zedGraphControl1 = new ZedGraphControl();

 this.zedGraphControl1.Location = new System.Drawing.Point(36, 48);
            this.zedGraphControl1.Name = "zedGraphControl1";
            this.zedGraphControl1.ScrollGrace = 0;
            this.zedGraphControl1.ScrollMaxX = 0;
            this.zedGraphControl1.ScrollMaxY = 0;
            this.zedGraphControl1.ScrollMaxY2 = 0;
            this.zedGraphControl1.ScrollMinX = 0;
            this.zedGraphControl1.ScrollMinY = 0;
            this.zedGraphControl1.ScrollMinY2 = 0;
            this.zedGraphControl1.Size = new System.Drawing.Size(427, 247);
            this.zedGraphControl1.TabIndex = 0;
            this.Controls.Add(zedGraphControl1);

 private void ShowChart()
        {
            zedGraphControl1.GraphPane.CurveList.Clear();
            zedGraphControl1.GraphPane.GraphObjList.Clear();
            // clearing not teste


            GraphPane myPane = zedGraphControl1.GraphPane;


            myPane.Title.Text = "消費者學歷統計";  //設計圖表的標題
            myPane.XAxis.Title.Text = "學歷類型"; //X軸標題
            myPane.YAxis.Title.Text = "人數"; //Y軸標題
            //      myPane.XAxis.Type = ZedGraph.AxisType.Date;
            // Date wont work in our case


            PointPairList PPLa = new PointPairList();
            PointPairList PPLb = new PointPairList();
            PointPairList PPLc = new PointPairList();
            PointPairList PPLd = new PointPairList();


            for (int i = 1; i < 2; i++)
            {
                PPLa.Add(i, i + 3);
                PPLb.Add(i + 1, i + 4);
                PPLc.Add(i + 2, i + 5);
                PPLd.Add(i + 3, i + 6);
            }


            // dragged drawing baritems out of forloop
            BarItem myBara = myPane.AddBar("A", PPLa, Color.Red);
            BarItem myBarb = myPane.AddBar("B", PPLb, Color.Blue);
            BarItem myBarc = myPane.AddBar("C", PPLc, Color.Gray);
            BarItem myBard = myPane.AddBar("D", PPLd, Color.Black);


            zedGraphControl1.AxisChange();
            zedGraphControl1.Refresh();//這句話非常重要，否則不會立即顯示
        }

 private void ShowChart()
        {
            zedGraphControl1.GraphPane.CurveList.Clear();
            zedGraphControl1.GraphPane.GraphObjList.Clear();
            // clearing not teste


            GraphPane myPane = zedGraphControl1.GraphPane;
            // 畫圖面版標題
            myPane.Title.Text = "收入統計";
            // 畫圖面版X標題
            myPane.XAxis.Title.Text = "區域";


            myPane.XAxis.Scale.Min = 0;
            //初始化數據
            PointPairList list = new PointPairList();
            PointPairList list2 = new PointPairList();
            PointPairList list3 = new PointPairList();


            for (int i = 0; i < 5; i++)////這里的數量要和lable的一致，比如橫坐標顯示了5個lable，這里就要給5個
            {
                list.Add(i, i+1);
                list2.Add(i, i + 2);
                list3.Add(i, i + 3);
            }
            


            // 畫圖面版Y標題
            myPane.YAxis.Title.Text = "銷售情況";
            //柱的畫筆
            //    public BarItem AddBar(string 名稱, IPointList 數據, Color 顏色);

            BarItem myCurve = myPane.AddBar("收入1", list, Color.Blue);
            BarItem myCurve1 = myPane.AddBar("收入2", list2, Color.Purple);
            BarItem myCurve2 = myPane.AddBar("收入3", list3, Color.YellowGreen);

            //myCurve.Bar.Fill = new Fill(Color.Blue, Color.White, Color.Blue);//漸變
           // BarItem myCurve2 = myPane.AddBar("買農藥", list2, Color.Red);
           // myCurve2.Bar.Fill = new Fill(Color.Red, Color.White, Color.Red);
          //  BarItem myCurve3 = myPane.AddBar("買化肥", list3, Color.Green);
           // myCurve3.Bar.Fill = new Fill(Color.Green, Color.White, Color.Green);


            //myPane.XAxis.MajorTic.IsBetweenLabels = true;
            //XAxis標注
            string[] labels = { "產品1", "產品2", "產品3", "產品4", "產品5" };
            myPane.XAxis.Scale.TextLabels = labels;
            myPane.XAxis.Type = AxisType.Text;
            //圖區以外的顏色
           // myPane.Fill = new Fill(Color.White, Color.FromArgb(200, 200, 255), 45.0f);
            //背景顏色
           // myPane.Chart.Fill = new Fill(Color.Red, Color.LightGoldenrodYellow, 45.0f);


            zedGraphControl1.AxisChange();
            zedGraphControl1.Refresh();
        }