asp.net中生成饼状与柱状图实例

            else if (itemIndex == 5)
            {
                objColor = Color.Cyan;
            }
            else if (itemIndex == 6)
            {
                objColor = Color.Bisque;
            }
            else if (itemIndex == 7)
            {
                objColor = Color.Maroon;
            }
            else if (itemIndex == 8)
            {
                objColor = Color.Maroon;
            }
            else
            {
                objColor = Color.Blue;
            }
            return objColor;
        }
    }
}
二、新建生成饼状柱状图页面BZImage.aspx：
后台：
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 BLL;
using Models;
public partial class GridViewDemo_BZImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        GetBZIamge();
    }
    /// <summary>
    /// 生成饼状柱状图
    /// </summary>
    public void GetBZIamge()
    {
        DataTable dt = BLL.StudentBLL.SelAllStudent();
        string[] rows = new string[dt.Rows.Count];