Mono actually has a plug-compatible Linq to SQL, AND it has its own DB drivers. Even if you were so hopelessly dependent on Linq to SQL that you couldn't trivi

Mono actually has a plug-compatible Linq to SQL, AND it has its own DB drivers. Even if you were so hopelessly dependent on Linq to SQL that you couldn't trivially port to Microsoft's newer persistence solution, you're still not up a creek.