List of Free code Memcached
memcachedext - .NET library
A .NET library providing support for advanced caching scenarios, including memcached server.
netcached - memcached client for .NET
netcached is a lightweight, high performance .NET client for memcached protocol.
A general purpose Memcached client for the .NET platform developed for framework version 4.0
Smith Async .NET Memcached Client
Async .NET Memcached Client is a fully asynchronous implementation of a memcached client.
The advantage of a fully asynchronous client is that you do not have threads wasted in waiting for i/o operations.
The client is developed in c# 4.0. (Subject to change to 3.5 possible)