Render any optional place holder before the image data is obtained.
Render event arguments to use.
This method is called while an item is being loaded and the image data has not been obtained yet.
Derived classes can render a visual hint to the user to indicate that the item is being loaded.
You should encapsulate the code inside this method with a try/catch and handle the error correctly. This method will not automatically fire the ItemError event.
For an example, refer to ImageViewerVirtualizer.
Medical Web Viewer .NET