How to insert selected radio button value in database using list view in asp.net using c#

<b></b>This is my code. I want to insert the selected radio button value when clicked on NEXT button. Kindly help me with the aspx.cs code for the same.
    <asp:ListView ID="ListView1" runat="server" DataSourceID="SqlDataSource1">

    <LayoutTemplate>
    <table>
    <asp:PlaceHolder runat="server" ID="itemplaceholder" />
    </table>
    </LayoutTemplate>
    <ItemTemplate>

    <tr>
    <td>

    <img src='QuestionImages/<%#Eval("image") %>' height="1000" width="1000" />
    </td>
    </tr>

    <tr>
    <td>
     <asp:Label text='<%#Eval("Question") %>' runat="server" />
    </td>
    </tr>
    <tr>

    <td>
    <asp:RadioButton ID="option1" text='<%#Eval("Option1") %>' runat="server" GroupName="r1" />
    </td>
    </tr>
    <tr>
    <td>
    <asp:RadioButton  ID="option2" text='<%#Eval("Option2") %>' runat="server" GroupName="r1"/>
    </td>
    </tr>
    <tr>
    <td>
    <asp:RadioButton ID="option3"  text='<%#Eval("Option3") %>' runat="server" GroupName="r1"/>
    </td>
    </tr>
    <tr>
    <td>
    <asp:RadioButton ID="option4" text='<%#Eval("Option4") %>' runat="server" GroupName="r1"/>
    </td>

    </tr>



    </ItemTemplate>

    </asp:ListView>