基本结构：
第一步准备实体类：
[Serializable]
public class Person
{
/// <summary>
/// 编号
/// </summary>
public int Id { get; set; }
/// <summary>
/// 姓名
/// </summary>
public string Name { get; set; }
/// <summary>
/// 性别
/// </summary>
public string Sex { get; set; }
/// <summary>
/// 年龄
/// </summary>
public int Age { get; set; }
/// <summary>
/// 爱好
/// </summary>
public string Like { get; set; }
}
第二步：准备测试业务类
public class PersonManager
{
private List<Person> list = new List<Person>();
/// <summary>
/// 初始化
/// </summary>
public void Init()
{
aspx页:
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" CssClass="b">
<asp:ListItem Value="5">5 per page</asp:ListItem ......
