sremani != ZenoArrow (though if you read this sremani, thank you for attempting to clarify).
There are many 'multi-paradigm' languages, and C# is one of them. From the C# Wikipedia page...
https://en.wikipedia.org/wiki/C_Sharp_(programming_language)
"C# (pronounced as see sharp) is a multi-paradigm programming language encompassing strong typing, imperative, declarative, functional, generic, object-oriented (class-based), and component-oriented programming disciplines."
What makes a language 'functional' is first-class functions (i.e. functions that can be treated as values, which is what I was referring to in my earlier post).
As sremani said, F# is 'functional first', in the sense that the language is designed to make functional algorithms straightforward to express. You can write C# in a functional way too, but there's less syntactic sugar for this style of programming.
Hope that clears it up.
