Upload file .ashx IIS7 not working

Hi everyone!

I'm trying to upload a file through silverlight.

In visual studio everything work (obviously :( )

This is my code:

  private void Upload_Click(object sender, RoutedEventArgs e)
    {
      try
      {
        OpenFileDialog dlg = new OpenFileDialog();
        dlg.Multiselect = false;
        dlg.Filter = UPLOAD_DIALOG_FILTER;
        bool? retVal = dlg.ShowDialog();

        if (retVal != null && retVal == true)
        {
          progressBar.Visibility = Visibility.Visible;
          textBox.Visibility = Visibility.Visible;
          textBox.Text = "Upload starting...";
          pathTextBlock.Text = dlg.File.Name;

          _data = dlg.File.OpenRead();
          _bytesTotal = _data.Length;
          _bytesUploaded = 0;
          _fileName = dlg.File.Name;
          progressBar.Maximum = _bytesTotal;

          UploadFileChunk();
        }
      }
      catch (Exception ex)
      {
			.......
      }
    }

    private void UploadFileChunk()
    {
      try
      {
		//UPLOAD_URI= http://localhost:65295/FileUpload.ashx?filename={0}&append={1}&filepath={2} 
        textBox.Text = "Upload in progress...";
        string uploadUri = "";
        if (_bytesUploaded == 0)
        {
          uploadUri = String.Format(UPLOAD_URI, _fileName, 0, FILEPATH); // Dont't append
        }
        else if (_bytesUploaded < _bytesTotal)
        {
          uploadUri = String.Format(UPLOAD_URI, _fileName, 1, FILEPATH); // append
        }
        else
        {
          return;  // Upload finished
        }       

        byte[] fileContent = new byte[CHUNK_SIZE];
        int bytesRead = _data.Read(fileContent, 0, CHUNK_SIZE);
        _data.Flush();

        WebClient wc = new WebClient();
        wc.OpenWriteCompleted += new OpenWriteCompletedEventHandler(wc_OpenWriteCompleted);
        Uri u = new Uri(uploadUri);
        wc.OpenWriteAsync(u, null, new object[] { fileContent, bytesRead });
        _bytesUploaded += fileContent.Length;
      }
      catch (Exception ex)
      {
			.......
      }
    }

    void wc_OpenWriteCompleted(object sender, OpenWriteCompletedEventArgs e)
    {
      try
      {
        progressBar.Value = _bytesUploaded;
        if (e.Error == null)
        {
          object[] objArr = e.UserState as object[];
          byte[] fileContent = objArr[0] as byte[];
          int bytesRead = Convert.ToInt32(objArr[1]);
          Stream outputStream = e.Result;
          outputStream.Write(fileContent, 0, bytesRead);
          outputStream.Close();

          if (_bytesUploaded < _bytesTotal)
          {
            UploadFileChunk();
          }
          else
          {
            textBox.Text = "Upload complete!";
          }
        }
      }
      catch (Exception ex)
      {
			.......
      }
    }

Here is my ashx page

 [WebService(Namespace = "http://tempuri.org/")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  public class FileUpload : IHttpHandler
  {
    public void ProcessRequest(HttpContext context)
    {
      try
      {
        if (context.Request.InputStream.Length == 0)
          throw new ArgumentException("No file input");
        if (context.Request.QueryString["fileName"] == null)
          throw new Exception("Parameter fileName not set!");
        if (context.Request.QueryString["filepath"] == null)
          throw new Exception("Parameter filepath not set!");

        string fileName = context.Request.QueryString["fileName"];
        string path = context.Request.QueryString["filepath"];

        string filePath = Path.Combine(path, fileName);
        bool appendToFile = context.Request.QueryString["append"] != null && context.Request.QueryString["append"] == "1";

        FileMode fileMode;
        if (!appendToFile)
        {
          if (File.Exists(filePath))
            File.Delete(filePath);
          fileMode = FileMode.Create;
        }
        else
        {
          fileMode = FileMode.Append;
        }
        bool uploadSuccesful = false;
        while (!uploadSuccesful)
        {
          try
          {
            using (FileStream fs = File.Open(filePath, fileMode))
            {
              byte[] buffer = new byte[4096];
              int bytesRead;
              while ((bytesRead = context.Request.InputStream.Read(buffer, 0, buffer.Length)) != 0)
              {
                fs.Write(buffer, 0, bytesRead);
              }
              fs.Flush();
              fs.Close();
              uploadSuccesful = true;
            }
          }
          catch (IOException ex)
          {
            throw new Exception("IOException:" + ex.Message);
          }
          catch (Exception ex)
          {
            throw new Exception("Exception:" + ex.Message);
          }
        }
      }
      catch (Exception ex)
      {
       ..........
      }
    }

    public bool IsReusable
    {
      get
      {
        return false;
      }
    }
  }

When i debug my project, at the end of the upload i see "Upload complete" and i can find the file in my path.

When i release my project in IIS 7,  at the end of the upload i see "Upload complete" but i can't find the file in my path.
I get no error and I don't understand the problem!

Any advice?

Thank you!!!!!

Federica