One comes from cofee, as the other one has more of a musical background.

C# is the response from Microsoft to Sun's J2EE, it is the base language of their new .net (dot-net) plateform.

Syntax, grammar and object handling is similar in the two language (endles story of who copied who). Yet deployement method are different: Java still remains the main language to rely in a Virtual Machine, thus enabling compatibility cross-plateform (hint try to compile c# on a linux machine ;-)

_Stephane