WebApplication/Manage/User/Echart.aspx.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication.Manage.User
{
    public partial class Echart : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack) 
            {
                DataTable dt = DBUtility.DbHelperSQL.Query("select distinct ChannelName from Student order by ChannelName desc").Tables[0];
                ChannelName.DataSource = dt;
                ChannelName.DataValueField = "ChannelName";
                ChannelName.DataTextField = "ChannelName";
                ChannelName.DataBind();
                ListItem item = new ListItem();
                item.Text = "请选择...";
                item.Value = "";
                ChannelName.Items.Insert(0, item);

            }
        }
    }
}