using System;

public class Program

{

    public static void Main()

    {

        string fullpath = "D:\\ASN\\Documents\\ENU\\LO\\ANL\\File\\05003ede-59bf-45c6-bb57-a6111e9f18e0\\linux-cheat-sheet.pdf";

        string samplePath = "D:\\ASN\\Documents\\ENU\\LO";

        var result = fullpath.Replace(samplePath, "").Split('\\')[1];

        //var result = fullpath.Replace(samplePath, "").Split(new string[] { @"\" }, StringSplitOptions.None)[1];

        Console.WriteLine(result);

    }

}