The ThumbnailLoadEventArgs type exposes the following members.
Gets or sets a value indicating whether this operation should be canceled.
Gets the filename of the image file that is to be loaded. This value is null (Nothing in VB) if the image was not loaded from a file.
Gets or sets the AtalaImage that was passed into the Thumbnail control. This value is null (Nothing in VB) if the image is not loaded from an AtalaImage.
Gets or sets the stream used to create the thumbnail. This value is null (Nothing in VB) if the image is not loaded from a stream.