using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Diagnostics;

using System.Data;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var str = new List<string>() { 

                        @"C:\Users\rosunkari\Desktop\SBM\MyPurposeCode\FilePath\chfs_kynect_ins_agents_20210121_02_35_09_PM.csv",

                        @"C:\Users\rosunkari\Desktop\SBM\MyPurposeCode\FilePath\chfs_kynect_ins_agents_20210121_03_40_09_AM.csv",

                        @"C:\Users\rosunkari\Desktop\SBM\MyPurposeCode\FilePath\chfs_kynect_ins_agents_20210221_03_35_09_PM.csv",

                        @"C:\Users\rosunkari\Desktop\SBM\MyPurposeCode\FilePath\chfs_kynect_ins_agents_20210221_04_40_09_AM.csv"};

        var order = str.OrderBy( f => f.Substring(f.LastIndexOf("agents_")+1)).ToList();

        foreach(var s in order)     {

            Console.WriteLine(s);

        }

    }

}