using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        ViewModel vm = new ViewModel();

        vm.TextAreaModel = "abcd\nefgh\nijkl\n\rmnop\nqrstu\r\nvwxyz";

        List<string> list = vm.TextAreaModel.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries).ToList();

        foreach (var items in list)

        {

            Console.WriteLine(items);

        }

        Console.WriteLine("------");

        List<string> list2 = vm.TextAreaModel.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.RemoveEmptyEntries).ToList();

        foreach (var items in list2)

        {

            Console.WriteLine(items);

        }

    }

}

​

public class ViewModel

{

    public string TextAreaModel { get; set; }

}