database table Update using gridview with image buttons and code behind event??

hi,
i have a database table called ModelResponce

ResponceId - Int Primary Key
CampaignId - Int
Status int - int
ModelId . GUID
All I want to do is update Status Column.  (and the user clicks one of 3 buttons to do this that
add 1, 2 or 3 to the table)

My code
Aspx page

3 image buttons within a gridview. Not sure if they should be in a gridvew but how do i gtg

         <asp:GridView ID="GridView1" runat="server" DataSourceID="ObjectDataSource4"              AutoGenerateColumns="False" DataKeyNames="ResponceId">              <Columns>     & ...