Записать результат программы в текстовый файл

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Text.RegularExpressions;
 
namespace Split
{
    class Program
    {
        static void Main(string[] args)
        {
            string line = System.IO.File.ReadAllText(@"C:\часть.txt");
 
            foreach (string word in line.Split())
            {
                if (word.StartsWith("http"))
                    Console.WriteLine(word);
                StreamWriter SW = new StreamWriter(new FileStream("FileName.txt", FileMode.Create, FileAccess.Write));
                SW.Write(word);
                SW.Close();
            }
        }
    }
}

StreamWriter SW = new StreamWriter(new FileStream("FileName.txt", FileMode.Create, FileAccess.Write));

StreamWriter r = new StreamWriter("file", true/false);

StreamWriter r = new StreamWriter(string, boolean,Encoding);

using (StreamWriter writer = new StreamWriter("FileName.txt"))
{
    foreach (string line in File.ReadLines(@"C:\часть.txt"))
    {
        foreach (string word in line.Split())
        {
            if (word.StartsWith("http"))
            {
                Console.WriteLine(word);
                writer.WriteLine(word);
            }
        }
    }
}