I don't fully understand the question but I think you are looking to loop through your upload controls. Put them in a placeholder
<asp:PlaceHolder ID="placeUplode" runat="server">
<asp:FileUpload ID="ObjFileUploader1" runat="server" />
<asp:FileUpload ID="ObjFileUploader2" runat="server" />
<asp:FileUpload ID="ObjFileUploader3" runat="server" />
<asp:FileUpload ID="ObjFileUploader4" runat="server" />
<asp:FileUpload ID="ObjFileUploader5" runat="server" />
</asp:PlaceHolder>
then in your code access them like this
foreach(FileUpload uploader in placeUplode.Controls.OfType<FileUpload>())
{
System.Diagnostics.Debug.WriteLine(uploader.ID);
if (uploader.HasFile)
{
}
}