关于ASP.net（Web表单）架构的问题

I'm currently working on a ASP.net project that will plug (virtual directory) into a "parent" ASP.net project sort like a module. Since my project have its own Global.asax, web.config, error handling...etc. Would it interfere with the parent project written by someone else? If I'm not mistaking, ASP.net treat each virtual directory as independent so it shouldn't interfering the parent but isn't the flow of the application feel weird and since the whole application will done by different person, won't this approach cause maintenance nightmare if each programmer written differently or in different language.I'm currently working on a ASP.net project that