可以考虑使用MSCHART，但是缺点是显示不太好看，不很专业，同时，如果客户端没有装的话就比较麻烦，因为显示不出来，所以一般的网站都采用生成图片的方式。下面给出MSCHART的一些东西，可以自己考虑着使用，我没有使用过其他的控件，所以不能给你满意的答复。另外附给你一个网址，www.tjinfo.com,里面有个调查题，使用了MSCHART，但是没有用折线，这个你可以自己定义的，CSDN的调查也使用了MSCHART。
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看看我的这篇总结，你会受益匪浅！
关于Mschart的说明文档

MsChart是微软制作的功能强大的图表工具，用它可以很方便的建立各种图表。制作各种3维2维的直方图，折线图。结合前一段时间我对Mschart组件的认识，谈谈Mschart组件的使用方法。
1、 Chart Activex控件：
In the HTML page, insert an <OBJECT tag for the License Manager object before any other <OBJECT tags. The License Manager is an ActiveX control that is installed with Internet Explorer.
NOTE: This CLASSID, "5220cb21-c88d-11cf-b347-00aa00a28331", is for the License Manager and not for your ActiveX controls. You must use the same CLASSID every time you refer to the LPK file. In addition, you should keep the Name property of the <PARAM tag as "LPKPath", and set the Value property for the <PARAM tag of the License Manager object to the LPK file name and path. This path may be a relative path but must not refer to a UNC share or a URL on another domain.
Because you can only have one LPK file for each HTML page, make sure that you include all of the licensed ActiveX Controls for the page when you generate your LPK file. For example:
  <object CLASSID="clsid:5220cb21-c88d-11cf-b347-00aa00a28331"
id="Microsoft_Licensed_Class_Manager_1_0"
  <param NAME="LPKPath" VALUE="mschart.lpk"
</object
Insert the <OBJECT tag for your licensed control afterward. For example, an HTML page that displays the Microsoft Masked Edit control looks like this.
Here  I downloaded the file mschart.cab from Microsoft's website.  It has been digitally signed.
<OBJECT classid="clsid:3A2B370C-BA0A-11D1-B137-0000F8753F5D"
id=mschart1 style="HEIGHT: 326px; WIDTH: 651px" CODEBASE="mschart.cab"</OBJECT
You can look this acticle if you need help.
http://support.microsoft.com/support/kb/articles/Q159/9/23.ASP
2、 Mschart组件的一些常用属性介绍
a、charttype：图形的类型
charttype=0三维直方图
charttype=1二维直方图
charttype=2三维折线图
charttype=3二维折线图
charttype=4三维面积图
charttype=5二维面积图
charttype=14饼图
b、showlegend：是否显示解说
c、titletext：标题
d、Columncount: The number of data columns
e、Rowcount:The number of data rows
f、Footnotetext:The footnote text.
g、Plot: Returns a reference to a Plot object that describes the area upon which a chart is displayed.
h、row: A row number in the current column. Rows are numbered from top to bottom beginning with 1. column: The current data column.
i、Rowlabel: The text for a row label. The label you specify sets the label for the data points identified by the Row property. This label appears along the category axis for most chart types and is used as the label for each individual pie in a pie chart. Label text may not be displayed if it is too long to fit on a chart.columnlabel: . Label text associated with a column in the data grid.
j、Data: The data point value. If the current data point already contains a value, it is replaced by the new value. The chart is redrawn to reflect the new value for the current data point.
k、ChartData: A two-dimensional array that holds the data used to draw the chart. If the first series of a multi-dimensional array contains strings, those strings will become the labels of the chart.ChartData is the default property for the MSChart control.
It is so many properities about Mschart Activex.I only introduce so much.Now,I will provide your two example to