using System;

using System.Linq;

using System.Collections.Generic;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        var time = new TimeSpan(1,20,0);

        var a = time.ToString("G");

        Console.WriteLine(a);

        Console.WriteLine(resultado("c"));

        List<string> nombres = new List<string>

        {

            "Hola", "SI", null, string.Empty, "a","b","asdasdasdasdasdasd","seba"

        };

​

        var filtrados = nombres.Where(x=> x.ToUpper().Trim()=="SEBA");

        //filtrados.ForEach();

        string todo = "excel,pdf,zip,excel-zisp";

        var tieneExcelZip = todo.Contains("excel-zip");

        Console.WriteLine(tieneExcelZip);

        Console.WriteLine(Guid.NewGuid());

        DateTime now = DateTime.Now;

        DateTime dia1 = new DateTime(2021,9,1,8,0,0);

        DateTime dia2 = new DateTime(2021,9,2,18,0,0);

        Console.WriteLine(dia1.Day);

        Console.WriteLine(dia2.Day);

         int diferencial = 0;

        if (dia2.Day > dia1.Day)

        {

            Console.WriteLine(" ACA 1");

            diferencial = dia2.Day - dia1.Day;

        }

        else if (dia2.Month > dia1.Month)

        {

            Console.WriteLine("ACA 2");

            diferencial = 1 + dia2.Day - 1;

        }

        Console.WriteLine(diferencial);

        TimeSpan theoric = dia2 - dia1.AddDays(diferencial);

        Console.WriteLine(theoric);

        //Console.WriteLine(now.ToString("ddd dd/MM/yyyy"));

        int lastDayMonth = new DateTime(now.Year, now.Month + 1, 1).AddSeconds(-1).Day;

        //Console.WriteLine(lastDayMonth);

        //Console.WriteLine(DateTime.DaysInMonth(now.Year, now.Month));

    }

    public static string Mensaje()

    {

        bool corre = false;

        int total = 10;

        while(corre == false){

            if(total == 0){

                return "HOLA";

            }

            total--;

        }

        return string.Empty;

    }

    public static bool resultado(string texto){

        switch(texto){

            case "a":

            case "b":

                return true;

            default:

                return false;

        }

    }

     public static string Capitalize( string text) => text switch

     {

             null => throw new ArgumentNullException(nameof(text)),

             "" => throw new ArgumentException($"{nameof(text)} cannot be empty"),

             _ => text.First().ToString().ToUpper() + text[1..]

     };

}