asp.net radiiobutton

                        // 1st set of Radio buttons without AutoPostBack<asp:RadioButton ID="RadioButton7" runat="Server" GroupName="1stGroup" Text="Red" Checked="True"  /><asp:RadioButton ID="RadioButton8" runat="Server" GroupName="1stGroup" Text="Blue"  /><asp:RadioButton ID="RadioButton9" runat="Server" GroupName="1stGroup" Text="Green" />

we couldn't use groupname in checkbox. Anymethod similar to groupname in checkbox.....i dont wann write any coding for this.