Html duplicated with wkhtmltopdf

I am implementing an HTML to PDF conversion with wkhtmltopdf , I have two problems:

Deputy code:

Process process;
ProcessStartInfo processStartInfo = new ProcessStartInfo();
processStartInfo.FileName = Path.Combine(System.Web.HttpContext.Current.Server.MapPath("~"), "Utilities", "wkhtmltopdf", "wkhtmltopdf.exe");
processStartInfo.WorkingDirectory = @"D:\";

// run the conversion utility
processStartInfo.UseShellExecute = false;
processStartInfo.CreateNoWindow = true;
processStartInfo.RedirectStandardInput = true;
processStartInfo.RedirectStandardOutput = true;
processStartInfo.RedirectStandardError = true;

// note: that we tell wkhtmltopdf to be quiet and not run scripts
string args = "-q -n ";
args += "--disable-smart-shrinking ";
args += "";
args += "--outline-depth 0 ";
args += "--page-size A4 ";
args += " - -";

processStartInfo.Arguments = args;

process = Process.Start(processStartInfo);

using (StreamWriter stramWriter = process.StandardInput)
{
    stramWriter.AutoFlush = true;
    stramWriter.Write(myHTML);
}

//read output
byte[] buffer = new byte[32768];
byte[] file;
int read = 1;
using (var memoryStream = new MemoryStream())
{

   while (read>0)
    {
         read = process.StandardOutput.BaseStream.Read(buffer, 0, buffer.Length);

         memoryStream.Flush();
        // memoryStream.Position = 0;
        memoryStream.Write(buffer, 0, read);
   }

    file = memoryStream.ToArray();
}

process.StandardOutput.Close();
// wait or exit
process.WaitForExit(60000);

// read the exit code, close process
int returnCode = process.ExitCode;
process.Close();

process.Dispose();
//se guarda el archivo

File.WriteAllBytes(@"D:\test.pdf", file);