How can i create a DLL from a MODULE in VB.NET

Hi all, I'm a beginner in web-application with .NET but i'm not familiar with VB.NET. ....I have created a MODULE in my Web-Application and i have some functions in it. But for some reasons i want to convert this module to DLL or something like this. Now How can i create a DLL from a module and call its functions from code-behind. Please Help me.if possible please show me an article about this topic on the web. Best Regards.