using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        string id = "FooBar";

        string filepathOld = @"database\\Courses\\" + id + "\\Info.txt";

        string filepath = @"database\Courses\" + id + @"\Info.txt";

        string filepathInter = $@"database\Courses\{id}\Info.txt";

        var path = Path.Combine("database", "Courses", id, "Info.txt");

        Console.WriteLine(path);

        Console.WriteLine(filepathOld);

        Console.WriteLine(filepath);

        Console.WriteLine(filepathInter);

        Console.WriteLine(path);

    }

}