static void SendFile(ButtonIcon bt, FileInput input)
{
bt.Disabled = true;
var fd = new FormData ();
fd.Append ("userfile", input.Files [0]);
var rq = fd.Send ("SaveFileUrl");
rq.Done (() => "File Uploaded".LogSuccess (5000));
rq.Fail (()=> "{0}:{1}".Fmt(rq.Status, rq.StatusText).LogError());
rq.Always (() => bt.Disabled=false);
}
