using System;

using System.Text;

using System.Text.RegularExpressions;   

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        List<PayrunEmployee> employees = new List<PayrunEmployee>()

{

    new PayrunEmployee() {   BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 22, AlphabeticSort = "ChangP", FirstName = "Paydata", LastName = "Changed",  },

    new PayrunEmployee(){  BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 209, AlphabeticSort = "PatteM", FirstName = "Michele", LastName = "Patterson"   },

    new PayrunEmployee()  {  BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 208, AlphabeticSort = "PatteM", FirstName = "Michele", LastName = "Zadison"},

    new PayrunEmployee(){   BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 23, AlphabeticSort = "zimmcc", FirstName = "Max", LastName = "Durant"    },

 new PayrunEmployee(){ BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 27, AlphabeticSort = "zimmdd", FirstName = "Phil", LastName = "Farmer"},

    new PayrunEmployee(){ BaseWorkLocationName = "Dayton Restaraunt", EmployeeNumber = 27, AlphabeticSort = "zimmdd", FirstName = "Eve", LastName = "Ernest"},

    new PayrunEmployee(){ BaseWorkLocationName = null, EmployeeNumber = 30, AlphabeticSort = "even", FirstName = "Eve", LastName = "Thompson"},

new PayrunEmployee(){ BaseWorkLocationName = null, EmployeeNumber = 31, AlphabeticSort = "even", FirstName = "Eve2", LastName = "Thompson2"},

            new PayrunEmployee(){ BaseWorkLocationName = "10 Main Street", EmployeeNumber = 32, AlphabeticSort = "even", FirstName = "Eve3", LastName = "Thompson3"},

};

        var orderedEmployees = employees

                       .OrderBy(l => l.BaseWorkLocationName == null)

                        .ThenBy(l => GetNumericPart(l.BaseWorkLocationName))

                        .ThenBy(l => l.BaseWorkLocationName)

                        .ThenBy(l => l.EmployeeNumber)

                      .ThenBy(l => l.AlphabeticSort)

                        .ThenBy(l => l.LastName)

                        .ThenBy(l => l.FirstName);

        foreach(var employee in orderedEmployees)

        {

            Console.Write(employee.BaseWorkLocationName ?? "null");

            Console.Write(" , ");

Console.Write(employee.AlphabeticSort);

            Console.Write(", ");

Console.Write(employee.EmployeeNumber);

            Console.Write(" ,");

            Console.Write(employee.LastName);

            Console.Write(", ");

            Console.Write(employee.FirstName);

            Console.WriteLine();

        }

    }

 private static int GetNumericPart(string name)

 {

     if (int.TryParse(name?.Split(' ')[0], out int number))

     {

         return number;

     }

     return int.MaxValue;

 }

    public class PayrunEmployee

{

    public string BaseWorkLocationName { get; set; }

    public string AlphabeticSort { get; set; }

    public string LastName { get; set; }

    public string FirstName { get; set; }

    public int EmployeeNumber { get; set; }

}

}