the put method

public static async Task Put(string postData)
{
  using(var httpClient = new HttpClient())
  {
    string authUserName = "user";
    string authPassword = "password"
    string url = "https://someurl.com";

    // If you have no basic authentication, you can skip thses lines
    var authToken = Encoding.ASCII.GetBytes($"{authUserName}:{authPassword}");
    httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(authToken));

    // The actual put method including error handling
    using(var content = new StringContent(postData))
    {
      var result = await httpClient.PutAsync($"{url}", content);
      if (result.StatusCode == HttpStatusCode.OK)
      {
        return;
      }
      else
      {
        // Do something with the contents, like write the statuscode and
        // contents to a log file
        string resultContent = await result.Content.ReadAsStringAsync();
        // ... write to log
      }
    }
  }
}