如何使用ASP.NET将不同的选定复选框值插入数据库？

<tr>
 <td>
   <asp:CheckBox ID="checkdoc" runat="server" Checked="false" />:Document
 </td>
 <td>
   <asp:CheckBox ID="checktwocheque" runat="server" Checked="false" />:Two Cheques
 </td>
 <td>
   <asp:CheckBox ID="checkIdprf" runat="server" Checked="false" />:ID Proof
 </td>
</tr>
<tr>
  <td>
   <asp:CheckBox ID="checkpancrd" runat="server" Checked="false" />:PAN Card
  </td>
  <td>
   <asp:CheckBox ID="checkAddrssprf" runat="server" Checked="false" />:Address Proof
  </td>
</tr>
<tr>
  <td colspan="4" align="center">
   <asp:Button ID="btnfarmrecordsave" runat="server" Text="Save" OnClientClick="return Validations();"
    OnClick="btnfarmrecordsave_Click" />
  </td>
</tr>
<tr>
 <td>
   <asp:CheckBox ID="checkdoc" runat