Adding const keyword breaks Path.Combine call

Question

No idea why when I change this:

using System;
using System.IO;

    public static class Constants
    {
        public static string  MainCarFilePath = Path.Combine(Environment.CurrentDirectory, "\\Cars.csv");
    }

to this:

using System;
using System.IO;


    public static class Constants
    {
        public const string MainCarFilePath = Path.Combine(Environment.CurrentDirectory, "\\Cars.csv");
    }

That now it breaks and it doesn't recognize the Combine method of the Path object (System.IO).

I get can't resolve Combine...

Answer 1

const requires that the value be constant at compile time.

Use public static readonly string, instead.