FlexCelAspViewer.ImageTimeout Property
Time in minutes that temporary images will live in the server before being deleted. Temporary images older than "current date - imageTimeOut" will be removed each time a new call to this component is made. Set this property to 0 or a negative value to not delete any image, if you wish to do the cleanup yourself using a server script. See also MaxTemporaryImages
Syntax
Namespace: FlexCel.AspNet
public Int32 ImageTimeout { get; set; }