webchart 的问题

Question

 用webchart 做了一个柱状图 ，结果纵坐标没有值 ，不知是怎么回事 
 前台  
       <form id="form1" runat="server">
    <div>
    
    </div>
    <Web:ChartControl ID="ChartControl1" runat="server" BorderStyle="Outset" 
        BorderWidth="5px">
    
      <YAxisFont StringFormat="Far,Near,Character,LineLimit" Text="errer" />
            <XTitle StringFormat="Center,Near,Character,LineLimit" Text="erererer" />
            <ChartTitle StringFormat="Center,Near,Character,LineLimit" />
            <XAxisFont StringFormat="Center,Near,Character,LineLimit" />
            <Background Color="LightSteelBlue" />   
            <YTitle StringFormat="Center,Near,Character,LineLimit" />
       
    
    </Web:ChartControl>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" 
        Text="Button" />
    <asp:Button ID="Button2" runat="server" onclick="Button2_Click" 
        Text="Button" />
    </form>
后台   
 private void button1_click()
    {
        //获取一个DataTable,具体函数略
      DataTable dt = new DataTable();
       if (dt != null)
                  {
        int count = 5;
        int count1 = 120;
        if (count > 0)
     
            
            //遍历DataTable为每条记录生成一个柱状
          for (int i = 0; i < count; i++)
            {
                //创建对象
                ColumnChart mychart = new ColumnChart();
                //设置柱子宽度
                mychart.MaxColumnWidth = 48;
                //颜色
                mychart.Fill.Color = System.Drawing.Color.Azure;
                //在柱子上显示数量
                mychart.DataLabels.Visible = true;
                //数量的字体
                mychart.DataLabels.Font = new System.Drawing.Font("Verdana", 14);
                //添加
                  
          mychart.Data.Add(new ChartPoint(i.ToString(), float.Parse(count1.ToString())));
                //备注
                mychart.Legend = "fdfdf" + count;
                this.ChartControl1.Charts.Add(mychart);
                count1 += 80;
            }
            //辅助设置
            //背景色
            ChartControl1.Background.Color = System.Drawing.Color.FromArgb(165, 0, 16);
            ChartControl1.YAxisFont.ForeColor = System.Drawing.Color.FromArgb(165, 0, 16);
            ChartControl1.XAxisFont.ForeColor = System.Drawing.Color.FromArgb(165, 0, 16);
            //内部线条
            ChartControl1.Border.Color = System.Drawing.Color.FromArgb(200, 200, 200);
            //边框样式
            ChartControl1.BorderStyle = BorderStyle.None;
            //y最大值
            double max = double.Parse((count + 300).ToString());
            //递增值
            int intv = 2;            //数量小于16的情况
            if (max < 16)
            {
                max = 16;
            }
            //大于16的情况
            else
            {
                intv = int.Parse(Math.Ceiling(max / 8).ToString());
                max += intv;
            }
            //设置Y轴终点值
            ChartControl1.YCustomEnd = int.Parse(max.ToString());
            //y递增值
            ChartControl1.YValuesInterval = intv;
            //生成
            this.ChartControl1.RedrawChart();
        }
        //}
  }