Progress Bar + Upload FTP

Question

Tenho o seguinte código para upar uma imagem em um FTP. Queria mostrar uma barra de progresso. Achei um código na net de FTP e outro de progress bar com download. Tentei modificar para ter o que eu quero: FTP + upload. Bom, a imagem é upada normalmente, porém dá uma Exception na hora de chamar o método que atualiza a barra de progresso.
ERRO nessa linha: this.Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] { reqStream.Length, stream.Length });
--> reqStream.Length --> "This stream does not support seek operations"

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using FormularioBase;
using System.Threading;
using System.Net;
using System.IO;

namespace Framework.View
{
    public partial class frmFuncionario : frmBase
    {
        private Thread thread;
        private OpenFileDialog openFile = new OpenFileDialog();
        private Stream reqStream;
        private FileStream stream;
        private static int PercentProgress;
        private delegate void UpdateProgessCallback(Int64 BytesRead, Int64 TotalBytes);
        private string filePath;
        
        public frmFuncionario()
        {
            InitializeComponent();
        }

        private void btnUpload_Click(object sender, EventArgs e)
        {
            openFile.Filter = "Imagens|*.jpg;*png|Imagens PNG|*.png|Imagens JPG|*jpg";
            if (openFile.ShowDialog() == DialogResult.OK)
            {
                filePath = openFile.FileName;
                picFoto.ImageLocation = filePath;

                thread = new Thread(Upload);
                thread.Start();
            }
        }

        private void UpdateProgress(Int64 BytesRead, Int64 TotalBytes)
        {
            // Calculate the download progress in percentages
            PercentProgress = Convert.ToInt32((BytesRead * 100) / TotalBytes);
            // Make progress on the progress bar
            progressBar.Value = PercentProgress;
            // Display the current progress on the form
            lblProgressBar.Text = "Uploaded " + BytesRead + " de " + TotalBytes + " (" + PercentProgress + "%)";
        }

        private void Upload()
        {
            try
            {
                FtpWebRequest request = (FtpWebRequest)FtpWebRequest.Create("ftp://aaaaaaaaaa/" + Path.GetFileName(filePath));
                request.Method = WebRequestMethods.Ftp.UploadFile;
                request.Credentials = new NetworkCredential("aaaaa", "aaaaa");
                request.UsePassive = true;
                request.UseBinary = true;
                request.KeepAlive = false;

                stream = File.OpenRead(filePath);
                byte[] buffer = new byte[stream.Length];
                int bytesSize = 0;

                reqStream = request.GetRequestStream();

                while ((bytesSize = stream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    reqStream.Write(buffer, 0, bytesSize);
                    this.Invoke(new UpdateProgessCallback(this.UpdateProgress), new object[] { reqStream.Length, stream.Length });
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Não foi possível concluir a operação\n" + ex.Message, "Mensagem", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                reqStream.Close();
                stream.Close();
            }
        }
    }
}

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