A question on ASP.NET security

Hi experts

I have a webpage that is written in ASP.NET.  From this page I call classes from a managed C++ class library dll. This C++ dll implements some proprietory algorithms which I do not want to be known. The ASP page is hosted on a Windows 2003 Server.

I have some questions reg this setup. I have only a limited knowledge on web development and related security issues. So my questions may be absurd. So please bear with me.

1. How safely can I tell that the information in this dll cannot be accessed by a user accessing this ASP.NET webpage?
2. How difficult will it be for somebody to find out the location and directly download this dll?

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bost issues (more or less simply) depend on the setup/configuration of your web server
For example, if the web server is not hardend to disallow directory indexing and/or forcefull browsing, it's most likely possible to download your dll.
Also any application run by the the web server needs to validate all inpout properly, to inhibit things like forcefull browsing, code injection (i.e. ASP), SQL injection, OS command injection. etc.
In other words: web application security is what you have to take care about.
You may start here to get used to it:

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