如何在Repeater控件中访问RadioButton的值

<asp:Repeater ID="myRepeater" runat="server">
    <ItemTemplate>
        <asp:RadioButton ID="myRadioButton" runat="server" GroupName="radioGroup" />
    </ItemTemplate>
</asp:Repeater>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // 绑定数据到Repeater控件
        myRepeater.DataSource = GetDataSource();
        myRepeater.DataBind();
    }
}

protected void SubmitButton_Click(object sender, EventArgs e)
{
    foreach (RepeaterItem item in myRepeater.Items)
    {
        if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
        {
            RadioButton radioButton = item.FindControl("myRadioButton") as RadioButton;
            if (radioButton != null && radioButton.Checked)
            {
                string value = radioButton.Text;
                // 处理选中的RadioButton的值
                // ...
            }
        }
    }
}