When we use .NET Framework, the first thought goes to languages such as C# and VB.NET. If you want to write a program or services using a functional paradigm, probably your choice would include other languages, for example, Erlang, Haskell, Scala, Wolframe Language (Mathematica), and so on.
This occurs for a variety of reasons, such as the following:
The .NET Framework and its principal languages are related to object-oriented programming
The syntax of F# and the applications in the functional paradigm are totally different from any other .NET language
F# was born in Microsoft research and later used in specific sectors and environments
More functional languages, some of which were created many years before, were thought of exclusively for this paradigm
Contrary to the reasons just written, F# is a very interesting language, because it combines the potential of the .NET Framework with a simple syntax and the functional paradigm.