把对象的属性绑定到datalist中，建一个实体类，利用泛型，产生实体对象数组,把实体对象数组赋给datalist.DataSource...................

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0.把对象的属性绑定到datalist中，首先建一个实体类，利用泛型，产生实体对象数组,把实体对象数组赋给datalist.DataSource,再把属性绑定到相应的控件<%# Eval("User_name")%>
1.default.aspx代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<title>Untitled Page</title>

</head>

<body>

<asp:ScriptManager ID="ScriptManager1" runat="server" />

<div>

<asp:DataList ID="DataList1" runat="server">

</asp:DataList></div>

</form>

</body>

</html>

2.default.aspx.cs代码

using System;

using System.Data;

using System.Configuration;

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 test;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

testuser testu1 = new testuser();

testu1.ReturnUserName(DataList1);

}

3.类库--放到App_Code中的test.cs中

using System;
using System.Data;
using System.Configuration;
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 System.Collections.Generic;
using System.Data.SqlClient;
/// <summary>
/// test 的摘要描述
/// </summary>
///
namespace test
{
    public class user
    {    public user(string username)
            {
                User_name = username;
            }
        private string user_id;

        public string User_id
        {
            get { return user_id; }
            set { user_id = value; }
        }
        private string user_name;

        public string User_name
        {
            get { return user_name; }
            set { user_name = value; }
        }

    }
    public class testuser
    {
        public void ReturnUserName(DataList datalist)
        {
            IList<user> users = new List<user>();
            SqlConnection con = new SqlConnection("server=.;database=bbs;uid=sa;pwd=omanlaolao");
            //根据具体数据库修改
            con.Open();
            SqlCommand cmd = new SqlCommand("select User_name from Users",con);
            //根据具体的表修改
            SqlDataReader sdr=cmd.ExecuteReader();
            while(sdr.Read())
            {
                users.Add(new user(sdr[0].ToString()));
            }
            datalist.DataSource=users;
            datalist.DataBind();
        }
    }
}