public void addImage(String _imageId, Image _image)
{
if (String.IsNullOrWhiteSpace(_imageId) || _image == null || imageCache == null || imageCacheNew == null)
return;
if (imageCache.ContainsKey(_imageId))
imageCache.Remove(_imageId);
imageCache.Add(_imageId, (Image)_image.Clone());
if (imageCacheNew.ContainsKey(_imageId))
imageCacheNew.Remove(_imageId);
imageCacheNew.Add(_imageId, (Image)_image.Clone());
}