We converted several ASP classic applications to .net and in the process of converting others.
We first divided them into two groups - those that we completely converted before replacing the old with new ones, and then those that we could convert gradually.
For this second group, it was useful to create some title and sidebar controls for the application, which also involved some of the more programmable parts - security, navigation, etc., and then use an iframe to store ASP classic articles in areas that we have not received yet.
This was pretty painless, as we can pull out the old and insert the new one according to our own schedule, instead of rewriting the entire massive application before moving forward. It also helped us adapt changes and new features to our customers' needs.
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