» 3. C# Sample Code: Generate unique HardwareID with C# (C-Sharp)

                using System;
                using System.Collections.Generic;
                using System.ComponentModel;
                using System.Data;
                using System.Drawing;
                using System.Text;
                using System.Windows.Forms;
                using System.Runtime.InteropServices;  //DllImport namespace
                
                namespace Project
                {
                    public partial class Form1 : Form
                    {
                        // Declare Statement, Import HardwareID.dll
                        [DllImport("HardwareID.dll")]
                        public static extern void SetLicenseKey(string LicenseKey);
                
                        [DllImport("HardwareID.dll")]
                        public static extern void SetAppName(string AppName);
                
                        [DllImport("HardwareID.dll", EntryPoint = "GetHardwareId", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
                        public static extern int GetHardwareId(bool HDD, bool NIC, bool CPU, bool BIOS, StringBuilder lpHWID, int nMaxCount);
                
                        [DllImport("HardwareID.dll", EntryPoint = "IsInsideVMWare", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
                        public static extern bool IsInsideVMWare();
                
                        [DllImport("HardwareID.dll", EntryPoint = "IsInsideVirtualPC", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall, SetLastError = true)]
                        public static extern bool IsInsideVirtualPC();
                
                        public Form1()
                        {
                            InitializeComponent();
                        }
                
                        private void button1_Click(object sender, EventArgs e)
                        {
                            SetAppName("");
                
                            //Marshal.PtrToStringAnsi();
                            StringBuilder lpHWID = new StringBuilder(255);
                            GetHardwareId(cb_HDD.Checked, cb_NIC.Checked, cb_CPU.Checked, cb_BIOS.Checked, lpHWID, 255);
                            textBox1.Text = lpHWID.ToString();
                        }
                
                        private void button2_Click(object sender, EventArgs e)
                        {
                            SetAppName(textBox2.Text);
                
                            StringBuilder lpHWID = new StringBuilder(255);
                            GetHardwareId(cb_HDD.Checked, cb_NIC.Checked, cb_CPU.Checked, cb_BIOS.Checked, lpHWID, 255);
                            textBox3.Text = lpHWID.ToString();
                        }
                
                        private void Form1_Load(object sender, EventArgs e)
                        {
                            SetLicenseKey("Your-License-Key");
                
                            if (IsInsideVMWare())
                            {
                                labVMWare.Text = "Yes";
                            }
                        }
                    }
                }