//Simple function for create log message

using System;
using System.IO;
using System.Runtime.CompilerServices;

public class Test
{
    static void Log(string message,
                    [CallerFilePath] string file = null,
                    [CallerLineNumber] int line = 0)
    {
        Console.WriteLine("{0} ({1}): {2}", Path.GetFileName(file), line, message);
    }

    static void Main()
    {
        Log("Hello, world");
        Log("This is the next line");
    }
}

/*
Output:

Test.cs (16): Hello, world
Test.cs (17): This is the next line
*/