The following script shows how you can call the FOP server from a .NET program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;


namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string xml;

// input xml data
xml="<?xml version=\"1.0\" encoding=\"iso-8859-1\"?> <departments><department><departmentName>R&amp;D</departmentName> <person> <name>John Schmidt</name> ";
xml=xml +"<address>Red street 3</address> <status>A</status> </person> <person> <name>Paul Bones</name> <address>White street 5</address> <status>A</status> ";
xml=xml +"</person> <person> <name>Mark Mayer</name> <address>Blue street 5</address> <status>A</status> </person> <person> <name>Janet Black</name> ";
xml=xml +"<address>Black street 8</address> <status>I</status> </person></department><department> <departmentName>Sales</departmentName> <person> ";
xml=xml +"<name>Juan Gomez</name> <address>Green street 3</address> <status>A</status> </person> <person> <name>Juliet Bones</name> <address>White street 5</address> ";
xml = xml + " <status>A</status> </person></department></departments>";


// call URL of FOP server passing the template name (XSL-FO file)
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("http://localhost:8087/J4LFOPServer/servlet?TEMPLATE=departmentEmployees.fo");
webRequest.ContentType = "text/xml";
webRequest.Method = "POST";

byte[] bytes = Encoding.ASCII.GetBytes(xml);

Stream os = null;
try
{ // send the Post
    webRequest.ContentLength = bytes.Length; //Count bytes to send
    os = webRequest.GetRequestStream();
    os.Write(bytes, 0, bytes.Length); //Send XML bytes
}
catch (WebException ex)
    { 
    }
finally
{
    if (os != null)
    {
    os.Close();
    }
}

try
{ // get the response
    HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
    Stream pdfStream=webResponse.GetResponseStream();
    long len = webResponse.ContentLength;

    byte[] pdfBytes=new byte[len];
    pdfStream.Read(pdfBytes,0,(int) len);
    pdfStream.Close();

    // save PDF to file
    FileStream fileOs=new FileStream("output.pdf", System.IO.FileMode.Create, System.IO.FileAccess.Write);
    fileOs.Write(pdfBytes, 0, pdfBytes.Length); 
    fileOs.Close(); 

}
catch (WebException ex)
{

}


}
}
}