i want to create a virtual printer,then get data from virtual printer and process data

i use Passthrough XPS driver to get data in xps type

then i install redmon to redirect the virtual printer to my c# program

my c# program get data and save it in a file,but i can't open file with xps viewer

this is my c# code

static void Main()
    {
        string fname = Environment.GetEnvironmentVariable("TEMP") + @"\";
        fname += "1.xps";
        FileStream fs = new FileStream(fname, FileMode.Create);
        StreamWriter sw = new StreamWriter(fs);
        StreamReader sr = new StreamReader(Console.OpenStandardInput());
        sw.Write(sr.ReadToEnd());
        sw.Flush();
        sw.Close();
        sr.Close();
    }

thanks