Gridview (simple Design)

<asp:GridView runat="server" AutoGenerateColumns="False" ID="grvEventFeedbackDetailList"
                    BackColor="White" BorderColor="#CC9966" BorderStyle="None" BorderWidth="1px"
                    CellPadding="4" Width="100%" AllowPaging="true" PageSize="10" EmptyDataText="No Feedbacks Found....."
                    OnRowDataBound="grvEventFeedbackDetailList_RowDataBound">
                    <Columns>
                        <asp:TemplateField HeaderText="Name">
                            <ItemTemplate>
                                <asp:HiddenField ID="hdnEventFeedBackId" Value='<%# Eval("Id") %>' runat="server" />
                                <%# Eval("Name") %>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Contact Number">
                            <ItemTemplate>
                                <%# Eval("ContactNumber") %>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Email">
                            <ItemTemplate>
                                <%# Eval("Email") %>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Feedback">
                            <ItemTemplate>
                                <%# Eval("Feedback") %>
                            </ItemTemplate>
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="Approved">
                            <ItemTemplate>
                                <asp:CheckBox ID="chkBoxApprove" runat="server" AutoPostBack="True" OnCheckedChanged="chkBoxApprove_CheckedChanged">
                                </asp:CheckBox>
                                <%--  <asp:LinkButton ID="lnkModify" runat="server" Text="" OnClick="lnkModify_Click">Modify</asp:LinkButton>--%>
                            </ItemTemplate>
                        </asp:TemplateField>
                    </Columns>
                </asp:GridView>