It is possible to re-write any application as a .NET application but if you are asking if there is a tool out there that will take ASP code and convert it to .NET code, no I don't believe there is. Really it would be an extremely difficult feat since, amongst other things, asp is a losely typed language (everything is declared as an object and not as a type) and asp.net is a strong typed language where by when you delcare your variables it must be given a type such as string or int.
hth.
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