http://blogs.msdn.com/b/junfeng/archive/2004/01/29/64265.aspxSuzanne has a discussion about binding context here . A binding context is really just a loaded assembly cache. MSDN describes how runtime locates assemblies here . What is missing is that there is a step 5. When we find an assembly, we put it in aen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/junfeng/archive/2004/01/29/64265.aspx#72271Fri, 13 Feb 2004 07:02:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:72271Junfeng Zhang's .Net Framework Notes<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=72271" width="1" height="1">