By default the RadBinaryImage control stores the BinaryImage in the
Cache object. In case your application
is configured to run in any of the
environments, listed below, there will be a problem accessing the binary
Web Farm - The application runs on more than one web server at the same time.
Garden - The application runs on a single server, but the server load
is divided among many worker processes (more than one process are
running the same application).
Usually, every server (or every worker process) has an
independent Cache, which means that, when the page request is not
handled by the same
web server (worker process), the BinaryImage will be null and a gray
image will be shown. To avoid this behavior, you should store the
in the Session, and configure your server environment to use out of
process Session State