C# 读写TXT文件遇到乱码问题

最初是用encoding.default后来改为下面这个就好了

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.IO;  
using System.CodeDom;  
  
namespace ConsoleApplication1  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
             FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
            StreamReader sr = new StreamReader(fs, Encoding.UTF8);

	     
            string s = fs.ReadLine();  
            string t = f.ReadLine();  
            while (s != null)  
            {  
                Console.WriteLine(s);  
                Console.WriteLine(t);  
                s = fs.ReadLine();  
                t = f.ReadLine();  
            }  
            fs.Close();  
            Console.ReadKey();  
        }  
    }  
}