http://blogs.msdn.com/jmstall/archive/2006/10/04/debugging_5F00_ngen_5F00_code.aspxYou can debug ngen (aka prejitted) code from VS2005 and also have the VS2005 IDE launch ngenned code. In practice, images are rarely ngenned as debuggable. And usually when under a debugger, assemblies are loaded with debuggable code-gen flags (In VS,en-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/jmstall/archive/2006/10/04/debugging_5F00_ngen_5F00_code.aspx#863336Mon, 23 Oct 2006 19:02:27 GMT91d46819-8472-40ad-a661-2c78acb4018c:863336Mike Stall's .NET Debugging Blog<p>Here's a list of things that may slow down execution under a debugger. I've seen a few threads go by</p> http://blogs.msdn.com/jmstall/archive/2006/10/04/debugging_5F00_ngen_5F00_code.aspx#1745611Fri, 23 Feb 2007 09:10:11 GMT91d46819-8472-40ad-a661-2c78acb4018c:1745611Mike Stall's .NET Debugging Blog<p>There is not always a 1:1 correlation between Managed modules and native modules. For example, Sometimes</p> http://blogs.msdn.com/jmstall/archive/2006/10/04/debugging_5F00_ngen_5F00_code.aspx#8519594Mon, 19 May 2008 22:59:57 GMT91d46819-8472-40ad-a661-2c78acb4018c:8519594ASP.NET Debugging<p>If you have done much debugging with .NET 2.0, you have probably come across these files before.&amp;#160;</p>