I have a grid-view on which each row consists check box, and there is a button outside the grid-view. when i check some rows on grid-view and clicking those button, i need to insert the checked rows details into another table of database. I have created the grid-view like this

```
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="student_name" HeaderText="student_name"                                                                                                                                                                   SortExpression="student_name" />
<asp:BoundField DataField="student_id" HeaderText="student_id"      SortExpression="student_id" ReadOnly="True" />
<asp:BoundField DataField="student_nric" HeaderText="student_nric" SortExpression="student_nric" />
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox AutoPostBack="false" Id="CheckBoxUpdate" runat="server" />
</ItemTemplate></asp:TemplateField>
</Columns>
</asp:GridView>  

```

but dont know how to store the checked rows value to datatable. please help