Radiobutton Mail sending value

Hi,
I have 5-6 radiobuttons and whenever user checks any one or two options from the page. The value of both the option should come in mail. I am stuck at that. Please see my code:-
<div id="ChkContributing" class="checkboxcss" runat="server"> <asp:RadioButton ID="chk100" runat="server" Text="Rs.100" GroupName="rupees"/> <asp:RadioButton ID="chk200" runat="server" Text="Rs.200" GroupName="rupees"/> <asp:RadioButton ID="chk300" runat="server" Text="Rs.300" GroupName="rupees"/> <asp:RadioButton ID="chk400" runat="server" Text="Rs.400" GroupName="rupees"/> ...