Image viewer has events that allow to control the process of image loading:

• ImageViewer.ImageLoading event - occurs when the image is loading. Information about the image (width, height, ...) is accessible after this event.
• ImageViewer.ImageLoadingProgress event - occurs when the loading progress of image is changed. Loading process can be canceled in this event.
• ImageViewer.ImageLoaded event - occurs when the image is loaded.
• ImageViewer.ImageLoadingException event - occurs when the image is not loaded because of error.
• ImageViewer.ImagePainted event - occurs when the image is painted. Image is visible in the viewer after this event.
• ImageViewer.ImageChanged - occurs when image is changed. Image viewer will reload image after this event.
• ImageViewer.ImageReloading - occurs when image is reloading from the source.
• ImageViewer.ImageReloaded - occurs when image is reloaded from the source. Image viewer will reload image after this event.
• ImageViewer.ImageSourceChanged - occurs when source of the image is changed. Image viewer will reload image after this event.