The NDepend tool is certainly what you are looking for C# code reverse engineering. NDepend comes with a dependency graph coupled with a dependency matrix. You can try NDepend straight on your code thanks to a Free Trial Edition. As a picture is worth a thousands words, see NDepend's screenshoots extracted from this blog post: Interactive Code Dependencies Graph
alt text http://codebetter.com/cfs-file.ashx/__key/CommunityServer.Blogs.Components.WeblogFiles/patricksmacchia.Graph/InternalDependenciesGraphSmall2.jpg
alt text http://codebetter.com/cfs-file.ashx/__key/CommunityServer.Blogs.Components.WeblogFiles/patricksmacchia.Graph/CycleGraphSmall2.jpg
alt text http://codebetter.com/cfs-file.ashx/__key/CommunityServer.Blogs.Components.WeblogFiles/patricksmacchia.CQLExport/Graph1.jpg
