File Upload with FTP

private void btnUpload_Click(object sender, EventArgs e)
       {

           //Load the file
           string filePath = txtFileName.Text;
           FileStream stream = File.OpenRead(filePath);
           byte[] buffer = new byte[stream.Length];

           stream.Read(buffer, 0, buffer.Length);
           stream.Close();

           //Upload file
           Stream reqStream = request.GetRequestStream();//request is declared globally
           reqStream.Write(buffer, 0, buffer.Length);
           reqStream.Close();

           MessageBox.Show("Uploaded Successfully");


       }