Read PDF hosted in my ASP: NET project

I need to read a PDF document that I have stored in a folder within my project, I have the following code but it does not do anything, I can not find the error:

protected void btnConfirmar_Click(object sender, EventArgs e)
    {
        bool a = File.Exists(@"C:\Proyectos\NuevoProyecto\MiProyecto\ModuloGeneral\ImpresionConf\pdfFile.pdf");
        string strLocalFilePath = @"C:\Proyectos\NuevoProyecto\MiProyecto\ModuloGeneral\ImpresionConf\pdfFile.pdf";
        string fileName = "pdfFile.pdf";
        Response.Clear();
        Stream iStream = null;
        const int bufferSize = 64 * 1024;
        byte[] buffer = new Byte[bufferSize];
        int length;
        long dataToRead;

        try
        {
            iStream = new FileStream(
                strLocalFilePath, 
                FileMode.Open, 
                FileAccess.Read, 
                FileShare.Read);
            dataToRead = iStream.Length; //--> iStream.Length = 24214
            Response.ContentType = "application/octet-stream";
            Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);

            while (dataToRead > 0)
            {
                if (Response.IsClientConnected)
                {
                    length = iStream.Read(buffer, 0, bufferSize);
                    Response.OutputStream.Write(buffer, 0, length);
                    Response.Flush();
                    buffer = new byte[bufferSize];
                    dataToRead = dataToRead - length;
                }
                else
                {
                    //prevent infinate loop on disconnect
                    dataToRead = -1;
                }
            }
        }
        catch (Exception ex)
        {
            log.Error("btnConfirmar_Click", ex);
            this.lblMensaje.Text = ex.Message.ToString();
        }
        finally 
        {
            if (iStream != null)
            {
                iStream.Close();
            }
        }
    }  

From what I could see debugging is that an exception occurs in the Stream:

  

ReadTimeout = '((System.IO.Stream) (iStream)). ReadTimeout' produced an exception of type 'System.InvalidOperationException'

And also in the WriteTimeout property:

  

WriteTimeout = 'iStream.WriteTimeout' produced an exception of type 'System.InvalidOperationException'