C# will make it easier to support in the future since more developers will know that language, but a port between languages will take the longest amount of time. If ASP.NET is close enough to ASP, using it could cut your development time by a great deal.
Is there a reason for moving from ASP to ASP.NET? If the old language is still supported and the software works as you need it to, the least expensive solution is to keep the old code.
Is there a reason for moving from ASP to ASP.NET? If the old language is still supported and the software works as you need it to, the least expensive solution is to keep the old code.