I switched the back-end on one application from MSacces to MSSQL a few years ago. Kept the front-end, because it worked well, and I didn't find anything as easy to use/modify.
I've never seen a MSAccess -> C# translator. However, you might be able to find a MSAccess to VB6 translator (their syntaxes are roughly similar), and from there there are VB6->VB.Net translators (and even VB.Net ->C# translators)
