A have a lot of code written in FORTRAN 77. I want start developing with c# using that code. What should I do?
For each of the options, could you please tell me how to do it. Is there any performance problem with first one?
Thank you.
See http://msdn.microsoft.com/en-us/library/26thfadc.aspx. I would go for option 1. In most cases it will be less work and produce better performance, assuming that you use Fortran for number crunching.
there is a commercial Fortran .net compiler
I side with Achim. For example, AMD is developing and supporting a linear algebra toolkit, written in FORTRAN 90, with a C-style interface available. With FORTRAN 77 YMMV
Option 1 is good if you have a lot of unmanaged code that you don't have time to migrate. If you go that route, make sure to perform as few calls to unmanaged methods as possible, even if those calls involve sending larger arguments/results as marshaling between managed/unmanaged world could harm performance.
Option 2 is fine, you will end up converting everything to managed code. Assuming this code is written properly, it could perform at least as fast as the unmanaged code.
