I had this idea last night and I haven't seen it mentioned before
I code almost exclusively in C# and I was trying to help someone with VB.Net code. Whenever this happens, I spend as much time trying to transliterate the VB as I do on the problem.
I am proposing that each of the IDEs (VB & c#) have a “paste as” option that allows you to paste code in one language and have it converted to the other.
(Very low priority feature)