using System;

public class Program

{

    public string s1 = "foo1";

    public string s2 = "foo2";

    public static void Main()

    {

        var program = new Program();

        program.DoStuff();

        Console.WriteLine(program.s1);

        Console.WriteLine(program.s2);

    }

    void DoStuff() 

    { 

        (s1, s2) = Test();

        Console.WriteLine(s1);

        Console.WriteLine(s2);

    }

​

    (string s1, string s2) Test() => ("bar1", "bar2");

}