asp.net 使用radiobuttonlist的困惑使用关键词New创建实例

折腾了一天了，精疲力尽了已经。贴到这里求救，救命啊！
页面部分：

<body>

<div>

<asp:RadioButtonList ID="RadioButtonList1" runat="server">

</asp:RadioButtonList></div>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />

</form>

</body>

</html>

cs部分方案一：

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

this.RadioButtonList1.Items.Add(new ListItem("test1", "test1"));

this.RadioButtonList1.Items.Add(new ListItem("test2", "test2"));

}

protected void Button1_Click(object sender, EventArgs e)

{

Response.Write(this.RadioButtonList1.SelectedItem.Value);

}

cs部分方案二：

protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack)

{

this.RadioButtonList1.Items.Add(new ListItem("test1", "test1"));

this.RadioButtonList1.Items.Add(new ListItem("test2", "test2"));

}

protected void Button1_Click(object sender, EventArgs e)

{

RadioButtonList rbl = new RadioButtonList();

rbl = (RadioButtonList)Page.FindControl("RadioButtonList1");

Response.Write(rbl.SelectedItem.Value);

}

尝试阿尝试，无尽的尝试，最终还是一个“请使用关键词New创建实例”，已经无语了，高手路过，请抽时间帮帮小弟，现在都共产主义社会了，总该有点共产主义精神吧？