Solr Binary Field to byte[]
//Example Text = /9j/4f/+RXhpZgAATU0AKgAAAAgACwEPAAIAAAASAAAAlAEQAAIAAAAMAAAAqAESAAMAAAA....
//Solr Binary Save into Base64 format
//just Convert from base 64
byte[] bytes = Convert.FromBase64String(record["Data"].ToString());