Assuming you've vbscript inside your asp pages..
If you are asking about running your asp app in asp.net platform - you can use ASP Classic Compiler http://aspclassiccompiler.codeplex.com/ to compile your asp app to run it as a .net app.
If you are asking about code conversion/migration, I suggest you to use the above asp classic compiler to compile your app first, then reflect the same using .NET reflector to reflect the code. If you are doing migration, migrate your asp app to an ASP.NET MVC app instead of a Webform app, as the conversion will be more natural.
Anoop Madhusudanan
Yet another Spiritual Programmer: See my blog for Design Patterns, Neural Nets, .NET recipes and more - http://amazedsaint.blogspot.com