Performing Codebase overhauls: .NET or Delphi?

I have little experience with C # .NET, but I have many years in Delphi. Any people from Delphi + .NET that can provide me some recommendations?

Here's the scoop:

I will be responsible for the overhaul of the code (200,000 lines +). We are going to create a complete n-tier architecture, and the front end is Silverlight. We chose Silverlight as the front end, because it can be deployed both in the browser and in the application with minimal effort from my research.

I could not find a clear comparison between the Remobjects SDK and WCF. Several threads I've seen mention issues with WCF, such as response time, high overhead, and somewhat snotty responses from MS .

This question is more suitable for the backend. Our current code base is in Delphi. Is it worth supporting the backend in Delphi, if at all possible? The discussion is about using WCF when migrating to .NET or using the Remobjects SDK (like .NET and Delphi) if you stick with Delphi.

Advantages of the Delphi backend + Silverlight interface:

  • Existing codebase: less time during migration
  • Existing Knowledge: Developers familiar with our code base are already familiar with Delphi
  • Easy Deployment: Simple exe / dll deployments are hard to ignore!
  • Cadence: SDK Remobjects has been strong for a long time.

Ends of Delphi Remobjects SDK backend + Silverlight + Remobjects SDK interface:

  • Technology: is it possible for Remobjects.NET to interact with Remobjects Delphi with Session features?
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