Сортировка строк по алфавиту в textBox





using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var our = new List<string>();
            our = textBox1.Text.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries).ToList();
            bool flag = true;
            while (flag)
            {
                flag = false;
                for (int i = 0; i < our.Count - 1; ++i)
                    if (our[i].CompareTo(our[i + 1]) > 0)
                    {
                        string buf = our[i];
                        our[i] = our[i + 1];
                        our[i + 1] = buf;
                        flag = true;
                    }
            }
            textBox1.Clear();
            foreach (string s in our)
               
                    textBox1.Text +=s.ToString()+System.Environment.NewLine;

           //Добавляем новую пустую строку 
          //textBox1.Text += "" + System.Environment.NewLine;
           
        }

    }
}