Add New Image Icon with ID Column in Gridview in asp.net

 <asp:TemplateField HeaderText="CustomerId" SortExpression="CustomerId">
 <ItemTemplate>
<asp:Label ID="lcustomerid" runat="server" Text='<%# Bind("CustomerId") %>'></asp:Label>
<asp:HiddenField ID="hflcustomerid" runat="server" Value='<%# Eval("CustomerId") %>' />
<asp:Image ID="Image1" ImageAlign="Middle" ImageUrl='<%# "/Images/" + (Convert.ToBoolean(Eval("NewImage"))? "flashing_new.gif" : "Modify.png")  %>'  runat="server"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("ComplaintID") %>'></asp:TextBox>
</EditItemTemplate>
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
<ItemStyle HorizontalAlign="Left" VerticalAlign="Middle" />
                                    </asp:TemplateField>