title: Write on a network folder from android (Xamarin) System.UnauthorizedAccessException
body: <p>I created a android app to create a stockage list by capturing code bars, the idea is to write a <code>csv</code> file in to a network folder, because I want the app to run as much offline as it's possible.</p>
  
  <p>Currently my code looks like:</p>
  
  <pre><code>        string path = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
          string filename = Path.Combine(path, "stock.csv");
          using (var streamWriter = new StreamWriter(filename, true))
          using (var writer = new CsvWriter(streamWriter))
          {
              foreach (var item in articulos)
              {
                  writer.WriteField(item.codbar);
                  writer.WriteField(item.reference);
                  writer.WriteField(item.quantity);
                  writer.NextRecord();
              }
          }
          string path2 = @"\\Desktop-jce8pl5\csv\stock.csv";
          File.Copy(filename, path2,true);
  </code></pre>
  
  <p>But I keep geting a System.UnauthorizedAccessException</p>
  
  <ul>
  <li>I tried to enter directly to the file from another computer and there
  is no problem. </li>
  <li>I give full permission to "all" and "network" </li>
  <li><p>I tried directly with IP I tried not to copy, just to create</p>
  
  <pre><code>    string path = @"\\Desktop-jce8pl5\csv\stock.csv";
      FileStream fs = null;
      if (File.Exists(path))
      {
          fs = File.Open(path, FileMode.Append);
      }
      else
      {
          fs = File.Create(path);
      }
  </code></pre></li>
  </ul>
  
  <p>But there is no way. 
  Any help?
  Thanks.</p>