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<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" />
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DropDownList1.Items.Add(new ListItem("aa", "0"));
DropDownList1.Items.Add(new ListItem("bb", "1"));
}
}
<asp:DropDownList ID="DropDownList1" runat="server" EnableViewState="false">
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" />