询问repeater中嵌套RadioButtonList问题

[harvesthouhao]

代码如下：
protected void Repeater1_ItemDataBound(object sender, System.Web.UI.WebControls.RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
DataRowView rowv = (DataRowView)e.Item.DataItem;

RadioButtonList rb = (RadioButtonList)e.Item.FindControl("RadioButtonList1");

rb.Items.Add(new ListItem("www1","a"));//从数据库怎么读
rb.Items.Add(new ListItem("www2","b"));//
rb.Items.Add(new ListItem("www3","c"));//
rb.Items.Add(new ListItem("www4","d"));//

}

}

为何前台的RadioButtonList1没有显示任何数据？？

[shawn_yang]

rb.bind()