Repeater 嵌套 Dropdownlist

//aspx

<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">

<ItemTemplate>

<asp:Label ID="Label1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "au_id" ) %>'></asp:Label>

<asp:DropDownList ID="DropDownList1" runat="server">

</asp:DropDownList>

<br />

</ItemTemplate>

</asp:Repeater>

//aspx.cs

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

SqlConnection cn = new SqlConnection(@"Server=.\SQLEXPress;uid=sa;pwd=password;Database=Pubs");

string strSQL = "select * from authors";

SqlCommand cmd = new SqlCommand(strSQL, cn);

cn.Open();

SqlDataReader dr = cmd.ExecuteReader();

Repeater1.DataSource = dr;

Repeater1.DataBind();

dr.Close();

cn.Close();

}

}

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)

{

Label label1;

DropDownList dropDownList1;

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

{

label1 = (Label)e.Item.FindControl("label1");

dropDownList1 = (DropDownList)e.Item.FindControl("dropDownList1");

SqlConnection cn = new SqlConnection(@"Server=.\SQLEXPress;uid=sa;pwd=password;Database=Pubs");

string strSQL = "select title_id from titleauthor where au_id = '" + label1.Text + "'";

SqlCommand cmd = new SqlCommand(strSQL, cn);

cn.Open();

SqlDataReader dr = cmd.ExecuteReader();

dropDownList1.DataSource = dr;

dropDownList1.DataTextField = "title_id";

dropDownList1.DataBind();

dr.Close();

cn.Close();

}

}