Step 1

Download the latest release of JoeBlogs from Codeplex
(Click the Downloads tab, and select the latest download)

Step 2

Unzip the contents of the downloaded zip file.
(I usually copy DLLs I am going to use into a “lib” folder at the root of my solution)

Step 3

Add a reference to BOTH CookComputing.XmlRpcV2.dll AND JoeBlogs.dll

Alex James Brown » Using JoeBlogs -metaWeblog API Wrapper

Post to WordPress using XML-RPC.

Referencing this article from Joe:

http://www.wynia.org/wordpress/2006/06/creating-a-basic-metaweblog-api-blogging-client-in-c/