c#multithreading soap xmlhttprequest thread-synchronization

Multithreading for making http post requests to web service

I want to send multiple HTTP post requests to a Web Service in C# .For example , if n=3 then http post requests from 3 xml files should be made and also the response should be written in a file.Once the first 3 requests are made then the next 3 requests will be made . So i made the following code but i was getting random outputs at first. But now i am getting either out of index range exception in the inner for loop or Internal server error (500). Plz suggest appropriate changes. I am using .NET4.0

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Threading;
using System.Xml;
using System.Net;
using System.Threading.Tasks;
namespace ConsoleApplication5
{
class Program
{
    static void Main(string[] args)
    {
        int n = 0;
        Console.WriteLine("Enter the number");
        string s = Console.ReadLine();
        int.TryParse(s, out n);
        string path = "C:\\";
        string[] files = null;
        files = Directory.GetFiles(path, "*.xml", SearchOption.TopDirectoryOnly);


        List<Task> tasks = new List<Task>(files.Length);

        for (int i = 0; i < files.Length; i += n)
        {
            for (int j = 0; j < n; j++)
            {
                int x = i + j;

                if (x < files.Length && files[x] != null)
                {
                    Task t = new Task(() => function(files[x]));
                    t.Start();
                    tasks.Add(t);
                }
            }

            if (tasks.Count > 0)
            {
                Task.WaitAll(tasks.ToArray(), Timeout.Infinite); // or less than infinite
                tasks.Clear();
            }
        }
    }
    public static void function(string temp)
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(temp);
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://10.76.22.135/wpaADws/ADService.asmx");

        request.ContentType = "text/xml;charset=\"utf-8\"";
        request.Accept = "text/xml";
        request.Method = "POST";
        Stream stream = request.GetRequestStream();
        doc.Save(stream);
        stream.Close();
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        using (StreamReader rd = new StreamReader(response.GetResponseStream()))
        {
            string soapResult = rd.ReadToEnd();
            doc.LoadXml(soapResult);
            File.WriteAllText(temp, doc.DocumentElement.InnerText);

            //XmlTextWriter xml=new XmlTextWriter(
            Console.WriteLine(soapResult);
            Console.ReadKey();
        }

    }

}

}

Solution

This code works . Explaination :

Firstly the user gives the source and destination paths for the .xml files.
Directory.getFiles() helps us to get the .xml files in the string array . (we have to pass .xml as a parameter) .
SO now what basically happens is for each file we get at the source pat , a thread is created .
But say if the user wants to send "n" requests at a time , then n threads are created at a time.
And the next set of threads are not created unless the previous threads are finished executing.
This is ensured by thread.Join().

And after a request is made to the web service , we get the response by getResponse() and the response is written in .xml files which are stored at the destination paths.

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.IO;
 using System.Threading;
 using System.Xml;
 using System.Net;
 namespace ConsoleApplication4
 {
     class Program
     {
      int flag = 1;
      string destination;
      string source;
      static void Main(string[] args)
    {
    Console.ForegroundColor = ConsoleColor.Red;

    Console.WriteLine("**************************** Send HTTP Post Requests **************************");
    int n = 0;
    Program p = new Program();
    Console.WriteLine("Enter the number of requests you want to send at a time");
    string s = Console.ReadLine();
    int.TryParse(s, out n);
    Console.WriteLine("Enter Source");
    p.source = Console.ReadLine();
    Console.WriteLine("Enter Destination");
    p.destination = Console.ReadLine();

    string[] files = null;
    files = Directory.GetFiles(p.source, "*.xml", SearchOption.TopDirectoryOnly);

    Thread[] thread = new Thread[files.Length];

    int len = files.Length;
    for (int i = 0; i<len; i+=n)
    {
        int x = i;
        //Thread.Sleep(5000);
        for (int j = 0; j < n && x < len; j++)
        {

            var localx = x;
            thread[x] = new Thread(() => function(files[localx], p));
            thread[x].Start();
            Thread.Sleep(50);
            //thread[x].Join();
            x++;
        }
        int y = x - n;
        for (; y < x; y++)
        {
            int t = y;
            thread[t].Join();

        }

    }

    // thread[0] = new Thread(() => function(files[0]));
    //thread[0].Start();
    Console.ReadKey();

}
public static void function(string temp,Program p)
{

    XmlDocument doc = new XmlDocument();
    doc.Load(temp);

    string final_d=p.destination + "response " + p.flag + ".xml";
    p.flag++;
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://10.76.22.135/wpaADws/ADService.asmx");
    request.ContentType = "text/xml;charset=\"utf-8\"";
    request.Accept = "text/xml";
    request.Method = "POST";
    Stream stream = request.GetRequestStream();
    doc.Save(stream);
    stream.Close();

    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    using (StreamReader rd = new StreamReader(response.GetResponseStream()))
    {
        string soapResult = rd.ReadToEnd();
        doc.LoadXml(soapResult);
        File.WriteAllText(final_d, doc.DocumentElement.InnerText);

        //XmlTextWriter xml=new XmlTextWriter(
        Console.WriteLine(soapResult);
        //Console.ReadKey();
    }
}

} }