using System.IO;

using System.Linq;

​

var a = 10;

a = a + - + - a;

//System.Console.WriteLine(a);

​

var file = @"C:\Users\marcin.jopowicz\OneDrive - SoftwareONE\Desktop\comparison.PNG";

System.Console.WriteLine(GetFileName(file));

​

string GetFileName(string fileName)

{

    var result = Path.GetFileName(fileName);

    if(!result.Contains('\\'))

    {

        return result;

    }

    return result.Split('\\').Last();

}