在DataGrid中实现Radio单选

//-------------aspx--------------
<asp:datagrid id="DataGrid1" runat="server" Font-Size="X-Small" AutoGenerateColumns="False" BorderColor="#CC9966"
                            BorderStyle="None" CellPadding="4" AllowPaging="True" AllowSorting="True" PageSize="15" BorderWidth="1px"
                            BackColor="White" Width="745px" DataKeyField="Coid">
                            <FooterStyle ForeColor="#330099" BackColor="#FFFFCC"></FooterStyle>
                            <SelectedItemStyle Font-Bold="True" ForeColor="#663399" BackColor="#FFCC66"></SelectedItemStyle>
                            <ItemStyle ForeColor="#330099" BackColor="White"></ItemStyle>
                            <HeaderStyle Font-Bold="True" ForeColor="#FFFFCC" BackColor="#990000"></HeaderStyle>
                            <Columns>
                                <asp:TemplateColumn HeaderText="Select">
                                    <ItemTemplate>
                                        <asp:Label id="Label2" Runat="server"></asp:Label>
                                        <asp:Label id=Label_Coid runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Coid") %>'></asp:Label>
                                    </ItemTemplate>
                                </asp:TemplateColumn>
            </Columns>
                            <PagerStyle NextPageText="[Next]" PrevPageText="[Previous]" HorizontalAlign="Right" BackColor="Gainsboro"></PagerStyle>
                        </asp:datagrid>
    
<asp:Label ID="Label3" Runat="server"></asp:Label>
//------------.cs---------
//绑定DataGrid中的ID值
private void DataGrid1_ItemDataBound(object sender,System.Web.UI.WebControls.DataGridItemEventArgs e)
        {
            if(e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
            {
                Label lbl;
                lbl = (Label)e.Item.FindControl("Label2");
                lbl.Text = "<input type=radio name='myradiogroup' value=" +((Label)e.Item.FindControl("Label_Coid")).Text + ">";
}                    
}
//--确定提交----
private void SaveCompany_Click(object sender, System.EventArgs e)
        {
            Label3.Text = Request.Form["myradiogroup"];
            foreach(DataGridItem i in DataGrid1.Items)
            {
                if(i.ItemType==ListItemType.AlternatingItem || i.ItemType==ListItemType.Item)
                {
                    Label r;
                    r = (Label)i.FindControl("Label2");
                    if(r.Text.IndexOf(Label3.Text)>0)
                    {
                        r.Text = "<input type=radio name='myradiogroup' value="+ ((Label)i.FindControl("Label_Coid")).Text+" Checked>";
                    }
                    else
                    {
                        r.Text = "<input type=radio name='myradiogroup' value=" + ((Label)i.FindControl("Label_Coid")).Text + ">";

                    }
                }
            }