Use FileUpload control in UpdatePanel

http://forums.asp.net/t/1384399.aspx

http://www.codeasp.net/blogs/vijjendra/microsoft.net/76/fileupload-inside-the-ajax-updatepanel

http://www.codeverge.net/ng.asp-net-forum.getting_started/why-is-my-fileupload.postedfile-always-null

http://www.muraton.net/post/2008/01/FileUpload-and-Ajax-UpdatePanel.aspx

http://www.codeverge.net/item.aspx?item=13329

http://forums.asp.net/t/968140.aspx