Hyper link in gridview

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ASP.NET

Hello

I have a subdomain, and i want to retrieve a file from that subdomain to main domain by hyperlink in gridview and i store path of that file in database. For that i use following code:

<Columns>
            <asp:BoundField DataField="id" HeaderText="S No" ReadOnly="True"  SortExpression="id" Visible="false" />
                <asp:TemplateField SortExpression="">
                    <ItemTemplate>
                         <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl='<%# Eval("pathname") %>'><%# Eval("remark")%></asp:HyperLink>
                       </ItemTemplate>
                </asp:TemplateField>
            </Columns>

here in pathname store the path of file only not including subdomain address so how could i do it.
I try lots of way but i am not sussess so plz help me soon
Thanks