Assemblies are supposed to be language independend so a .net assembly (.dll) written in c# is useable with delphi prism at once.
The commandline editions of delphi prism can be downloaded for free here:
https://downloads.embarcadero.com/free/delphi_prism
And here is howto use XNA with delphi prism aka chrome:
http://chrome.pascalgamedevelopment.com/
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