static void CometWorker_FileUploadRequested(ref HttpFile file)
{
string fileName = file.ServerMapPath + "\\Upload\\" + file.FileName;
file.SaveAs(fileName);
string resourceName = file.FileName.Replace("&", "_");
ResourceManager.AddReplaceResource(fileName, resourceName, ResourceType.Image, file.ClientId);
CometWorker.SendToClient(file.ClientId, JSON.Method("ShowImage", resourceName));
}