Nstrument's Snmp Library for .Net includes a Snmp Control, a Mib Parser and a Trap Receiver. The library also includes a C# unit test project (excellent for examples) and a Wpf Mib Browser with full source code. Flexible and intuitive syntax. You can use OID's or the strongly typed C# classes generated from the Mib Parser for requests. Supports both synchronous and asynchronous requests. Asynchronous requests use traditional Microsoft async patterns with callbacks and state. The MibService includes pre-compiled C# classes for RFC1213 and RFC1514, but C# classes can be generated for any Mib. Nstrument includes over 1,200 Mibs in the Mib Repository, including most Mibs published by Cisco. A basic MibBrowser (and all source code) is also included.
Currently, there is support for v1 and v2c; v3 will be coming soon. Nstrument offers a run time royalty free license model with a 30 day Trial Period. Purchases include 1 year free maintenance which gets you fee upgrades.