Repeater嵌套dropdownlist控件

<asp:repeater id="Repeater1" runat="server" onitemdatabound="Repeater1_ItemDataBound">

<itemtemplate>

<div>

<asp:dropdownlist id="drpUserList" autopostback="true" onselectedindexchanged="myDrop_SelectedIndexChanged" runat="server"></asp:dropdownlist>

</div>

</itemtemplate>

</asp:repeater>

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)

{

if (e.Item.ItemType == ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem||e.Item.ItemType==ListItemType.EditItem)

{

DropDownList myDrop = e.Item.FindControl("drpUserList") as DropDownList;

if (myDrop.Items.Count == 0)

{

myDrop.Items.Add(new ListItem("a", "1"));

myDrop.Items.Add(new ListItem("b", "2"));

myDrop.DataBind();

}

}

}

protected void myDrop_SelectedIndexChanged(object sender,EventArgs e)

{

Response.Write(((DropDownList)sender).SelectedIndex.ToString());

}