Wow... I keep forgetting that VB.net is still a thing. Pretty much everyone who was writing ASP code before the switchover adopted VB.net and then flipped over to C# around 2005 (.NET version 2).
Did you mean "are there other things called C# besides the language?" I think people missed the joke because they interpreted your comment as "are there other .NET languages?"
https://dotnet.microsoft.com/en-us/languages