Zapis do pliku w metodzie asynchronicznej

static void Main(string[] args)
{
 //To mi zapisuje
    File.AppendAllText(@"c:\TEMP\file.txt", "Rozpoczynam odczyt");
    Task.Run(new Action(GetEncoderCouter));
    
    
}

static HttpClient _client = new HttpClient();

static async void GetEncoderCouter()
{
    var result = await _client.GetAsync("http://10.0.3.225:8010/");
    string res = await result.Content.ReadAsStringAsync();
    if (result.IsSuccessStatusCode)
    {
        encoderClass enc = new encoderClass();
        enc = JsonConvert.DeserializeObject<encoderClass>(res);   
        //Tego nie zapisuje
        File.AppendAllText(@"c:\TEMP\file.txt", $"{DateTime.Now:f} {enc.counter}{Environment.NewLine}");            
    }
    
   
}

private static void Pobierz()
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://10.0.3.225:8010/");
        request.Method = "GET";
        HttpWebResponse webresponse;
        webresponse = (HttpWebResponse)request.GetResponse();

        Encoding encoding = System.Text.Encoding.GetEncoding(1250);
        StreamReader loResponseStream = new StreamReader(webresponse.GetResponseStream(), encoding);

        string Response = loResponseStream.ReadToEnd();

        loResponseStream.Close();
        webresponse.Close();

        encoderClass e = new encoderClass();
        e = JsonConvert.DeserializeObject<encoderClass>(Response);
        Console.WriteLine($"{DateTime.Now:yyyy-MM-dd HH-mm-ss}: {e.counter}{Environment.NewLine}");
        File.AppendAllText(@"c:\TEMP\file.txt", $"{DateTime.Now:yyyy-MM-dd HH-mm-ss}: {e.counter}{Environment.NewLine}");
    }
    catch (Exception ex)
    {

        Console.WriteLine(ex.Message);
        Console.ReadLine();
    }

}

class Program
{     
    static async Task Main(string[] args)
    {

        File.AppendAllText(@"c:\TEMP\file.txt", $"Rozpoczynam odczyt {Environment.NewLine}");
        await GetEncoderCouter();
        File.AppendAllText(@"c:\TEMP\file.txt", $"Koniec odczytu {Environment.NewLine}");
    }

    static HttpClient _client = new HttpClient();

    static async Task GetEncoderCouter()
    {
        var result = await _client.GetAsync("http://10.0.3.225:8010/");
        string res = await result.Content.ReadAsStringAsync();
        
        if (result.IsSuccessStatusCode)
        {
            encoderClass enc = new encoderClass();
            enc = JsonConvert.DeserializeObject<encoderClass>(res);
            File.AppendAllText(@"c:\TEMP\file.txt", $"{DateTime.Now:yyyy-MM-dd HH:mm:ss} {enc.counter}{Environment.NewLine}");
        } 
    }
         
}

class Program
{
    static void Main(string[] args)
    {
        File.AppendAllText(@"c:\TEMP\file.txt", $"Rozpoczynam odczyt {Environment.NewLine}");
                    
        var res = Task<string>.Run(() => GetEncoderCouter());
        encoderClass enc = new encoderClass();
        enc = JsonConvert.DeserializeObject<encoderClass>(res.Result);

        File.AppendAllText(@"c:\TEMP\file.txt", $"{DateTime.Now:yyyy-MM-dd HH:mm:ss} {enc.counter}{Environment.NewLine}Koniec odczytu {Environment.NewLine}");
    }

    static async Task<string> GetEncoderCouter()
    {

        HttpClient _client = new HttpClient();
        var result = await _client.GetAsync("http://10.0.3.225:8010");
        string res = await result.Content.ReadAsStringAsync();
        return res;
    }
}