public static string GetBiosSerialNumber()

 {

     string biosSerialNumber = string.Empty;

     try

     {

         // Win32_BIOS sınıfından verileri alıyoruz

         ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");

         ManagementObjectCollection queryCollection = searcher.Get();

         foreach (ManagementObject m in queryCollection)

         {

             // Seri numarasını alıyoruz

             biosSerialNumber = m["SerialNumber"]?.ToString();

             break; // Genelde tek bir BIOS bilgisi dönecektir

         }

     }

     catch (Exception ex)

     {

         Console.WriteLine("Hata oluştu: " + ex.Message);

     }

     return biosSerialNumber;

 }

 public static string md5sifreGet()

 {

     string biosSerial = GetBiosSerialNumber().Trim();

using System;

using System.Management;

using System.Net.Http;

using System.Security.Cryptography;

using System.Text;

namespace namespcaim.com

{

    public class Sabitler

    {

        public static bool GetLisans(string lisansKey)

        {

            try

            {

                string url = "http://ipadresi.com/api/GenelLisans/getLisans";

                string jsonData = $"{{ \"lisansKey\": \"{lisansKey}\" }}";

                using (HttpClient client = new HttpClient())

                {

                    var content = new StringContent(jsonData, Encoding.UTF8, "application/json");

                    HttpResponseMessage response = client.PostAsync(url, content).GetAwaiter().GetResult();

                    if (response.IsSuccessStatusCode)

                    {

                        string responseString = response.Content.ReadAsStringAsync().GetAwaiter().GetResult();

                        if (responseString.Contains("true"))

                        {

                            return true;

                        }

                    }

                }

            }

            catch

            {

                return false;

            }

            return false;

        }

        public static string cpuidGet()

        {

            var cpuid = string.Empty;

            string sQuery = "SELECT ProcessorId FROM Win32_Processor";

            ManagementObjectSearcher oManagementObjectSearcher = new ManagementObjectSearcher(sQuery);

            ManagementObjectCollection oCollection = oManagementObjectSearcher.Get();

            foreach (ManagementObject oManagementObject in oCollection)

            {

                cpuid = (string)oManagementObject["ProcessorId"];

                break;

            }

            return cpuid;

        }

        public static string hddserialGet()

        {

            var hddserial = string.Empty;

            ManagementObject dsk = new ManagementObject(@"win32_logicaldisk.deviceid=""c:""");

            dsk.Get();

            hddserial = dsk["VolumeSerialNumber"].ToString();

            return hddserial;

        }

        public static string motherboardserialGet()

        {

            var motherboardserial = string.Empty;

            ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_BaseBoard");

            ManagementObjectCollection moc = mos.Get();

            foreach (ManagementObject mo in moc)

            {

                motherboardserial = (string)mo["SerialNumber"];

                break;

            }

            return motherboardserial;

        }

        static string key = "sizinsifrenizunique";

        public static string md5sifreGet()

        {

            string anahtar = cpuidGet().Trim() + " " + hddserialGet().Trim() + " " + motherboardserialGet().Trim() + key;

            anahtar = Md5Sifrele(anahtar);

            anahtar = Md5Sifrele(anahtar);

            anahtar = Md5Sifrele(anahtar);

            return anahtar;

        }

        public static bool md5Coz(string sifre)

        {

            if (sifre.Equals(md5sifreGet()))

            {

                return true;

            }

            return false;

        }

        public static string Md5Sifrele(string str)

        {

            string result = string.Empty;

            try

            {

                MD5CryptoServiceProvider mD5CryptoServiceProvider = new MD5CryptoServiceProvider();

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

                byte[] array = mD5CryptoServiceProvider.ComputeHash(bytes);

                int capacity = (int)Math.Round((double)(array.Length * 3) + (double)array.Length / 8);

                StringBuilder stringBuilder = new StringBuilder(capacity);

                int num = array.Length - 1;

                for (int i = 0; i <= num; i++)

                {

                    stringBuilder.Append(BitConverter.ToString(array, i, 1));

                }

                result = stringBuilder.ToString().TrimEnd(new char[]

                {

            ' '

                });

            }

            catch (Exception)

            {

            }

            return result;

        }

    }

}

  private void Form1_Load(object sender, EventArgs e)

  {

      string sifre = Sabitler.md5sifreGet();

      bool lisansVarmi = Sabitler.GetLisans(sifre);

      if (lisansVarmi==false)

      {

          Clipboard.SetText(sifre);

          MessageBox.Show(sifre + Environment.NewLine + "Key kopyalandı. Yöneticiye iletin.");

          this.Close();

      }

      else

      {

          cefInit();

      }

  }