Configuration :: Name Doesn't Exist In Current Context

I have Called a Function " GetPhotos" from Designer Page (source). Getphotos() is in Code-behind Page. It runs well When i only Build the Application. But when i Publish the same application using "fixedName and single page Assemblies" option Enable, it Returns an Error

Compiler Error Message: CS0103: The name 'GetPhotos' does not exist in the current context.

what should i do? Code in Design page:

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Panel ID="pn1" runat="server" GroupingText="Facility's">
<table width="100%">
<tr>
<td style="text-align: left">
<asp:Label ID="Label2" runat="server" Height="100%"
style="font-size: 21pt; font-weight: 700; color: #996633" Width="100%"></asp:Label>
</td>
</tr>
<tr><td style="text-align: left"><asp:Label ID="Label3" runat="server"
style="text-align: justify"></asp:Label></td></tr>
<tr>
<td>
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
BackColor="White" BorderColor="#336666" BorderStyle="Double" BorderWidth="3px"
CellPadding="4" PageSize="15" Width="100%"
onselectedindexchanged="GridView1_SelectedIndexChanged">
<RowStyle BackColor="White" ForeColor="#333333" />
<FooterStyle BackColor="White" ForeColor="#333333" />
<PagerStyle BackColor="#336666" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#339966" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#336666" Font-Bold="True" ForeColor="White" />
</asp:GridView>
<%
GetPhotos(Label2.Text);
%>
</td>
</tr>
</table>
</asp:Panel>
</asp:Content>