DefaultObjectRegistry is obsolete, and you should switch to SimpleObjectRegistry or ReloadableObjectRegistry.For the open source edition of SharpSnmpLib.Mib, you will have to use
ReloadableObjectRegistry, which allows you to reload the tree by calling Reload. All modules will have to be reloaded even if only one module is edited.In the Pro edition of SharpSnmpLib.Mib (soon to release as a commercial product), when one module is edited, only affected modules will be reloaded, and it is automatically handled. So if you like, you can participate in the private beta,
http://www.lextm.com/2013/05/snmp-pro-private-beta-is-ready-and.html