how to การเช็คว่าเมื่อกด radiobutton ใน template ของ gridview ให้ค่าใน radio ออกมา

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">        
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="rdC1_0" AutoPostBack="true" GroupName="Courtesan" OnCheckedChanged="GoWithMe"
                        runat="server"></asp:RadioButton>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="rdC1_5" AutoPostBack="true" GroupName="Courtesan" OnCheckedChanged="GoWithMe"
                        Value="Jim" runat="server"></asp:RadioButton>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:RadioButton ID="rdC2_0" AutoPostBack="true" GroupName="Courtesan" OnCheckedChanged="GoWithMe"
                        runat="server"></asp:RadioButton>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:TextBox ID="txtReceiveSheGirl" runat="server"></asp:TextBox>

Public Class SheGirl
    Inherits System.Web.UI.Page

    Protected Sub GoWithMe(sender As Object, e As EventArgs)
        Dim SheGirl = DirectCast(sender, RadioButton)
        'Try Get Server Control ID, But Not Client ID
        Dim xDouble As Double = Convert.ToDouble(SheGirl.ID.Substring(SheGirl.ID.Length - 3).Replace("_", "."))
        txtReceiveSheGirl.Text = xDouble
    End Sub

End Class