Well since I learned them in my major I haven't earned money with them yet, but now that the school year is over I like to hobby with them.
And I can imagine C# is tough, but compared to C and C++ it's very similar to Java so going from Java to C# was easy for me.
C and C++ are kind of tough for me, though, but I rarely use them.
As for other languages, I know HTML, CSS, Javascript and SQL. No PHP yet but I learned to use C# ASP.NET as an alternative.
And I can imagine C# is tough, but compared to C and C++ it's very similar to Java so going from Java to C# was easy for me.
C and C++ are kind of tough for me, though, but I rarely use them.
As for other languages, I know HTML, CSS, Javascript and SQL. No PHP yet but I learned to use C# ASP.NET as an alternative.