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SharpPcap is a handy packet capture framework specially designed for the .NET environment and based on the famous pcap / WinPcap libraries. It provides an API for capturing, injecting, analyzing and building packets using any .NET language such as C# and VB.NET.

At the highest level all capture devices are of type ICaptureDevice. To retrieve a list of devices you should use SharpPcap.CaptureDeviceList. CaptureDeviceList returns an array of specific instances of devices but these are type ICaptureDevice so these devices can be delt with generically.

There are three types of devices:
LibPcapDevice
WinPcapDevice
AirPcapDevice

These devices are nested. An AirPcapDevice is a WinPcapDevice which is a LibPcapDevice. On Linux, which lacks AirPcap or WinPcap support, all devices will be LibPcapDevices. On Windows all devices should be WinPcap or AirPcapDevices.