using System;

using System.Collections.Generic;

​

public class Employee

{

    public string? Email { get; set; }

    public List<string> Languages { get; set; }

    public string FCs => "FCs";

    public string Role => "Role";

}

​

public class Program

{

    public static void Main()

    {

        var emp = new Employee();

        Console.Write("no mail: ");

        Console.WriteLine(IsRuEnWithEmail(emp));

        emp.Email = "pi@po.com";

        Console.Write("no lang: ");

        Console.WriteLine(IsRuEnWithEmail(emp));

        emp.Languages = new List<string>() { "ru", "en", "fr"};

        Console.Write("Matches: ");

        Console.WriteLine(IsRuEnWithEmail(emp));

    }

    public static string IsRuEnWithEmail(Employee emp) => emp switch

    {

        { Email: {}, Languages: ["ru", "en", ..] } => $"{emp.FCs}, {emp.Email}, {emp.Role}",

        _ => "",

   };

}