为什么CheckBoxList 的某一项的属性 不保持状态值呢？

[于娜]

namespace WebApplication1
{
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

if (!Page.IsPostBack)
{
CheckBoxList1.Items[0].Attributes["my"] = "yuna123";
}

}

protected void Button1_Click(object sender, EventArgs e)
{
Response.Write(CheckBoxList1.Items[0].Attributes["my"]);
}


}
}


提交后为什么不显示 attributes["my"] ???

[xuan.ye]

protected void Page_Load(object sender, EventArgs e)
{


CheckBoxList1.Items[0].Attributes["my"] = "yuna123";

不加ispostback
}