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The name xxx does not exist in the current context
<LoggedInTemplate>
    <b>Login ok ! </b><br />
        <asp:FileUpload ID="FileUpload1" runat="server" />
        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
        ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
        InsertCommand="INSERT INTO aspnet_PicturesHome(pUrl) VALUES (@pUrl)"
        SelectCommand="SELECT pID, pUrl FROM aspnet_PicturesHome">
            <InsertParameters>
                <asp:ControlParameter Name="pUrl" Type="String" ControlID="FileUpload1" PropertyName="FileName"/>
            </InsertParameters>
        </asp:SqlDataSource>
<asp:Label ID="Label1" runat="server" Text="Label">Foto upload: </asp:Label>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Upload" />
<br></br>
</LoggedInTemplate>

FileUpload fu = LoginView1.FindControl("FileUpload1") as FileUpload;

protected void Page_Load(object sender, EventArgs e){

if(!this.isPostBack)
{
  if(!Context.User.IsInRole("admin"))
  {
     //disable controls
  }
}
}