Have you thought about looking into this Code-Plex project Virtual Router?

Since you ve found a project that does exactly what you want, why not work on understanding that project?

It looks like most of the code you re interested in is in the "VirtualRouter.Wlan" project. Start there and try asking specific questions if you don t understand it.

        using System;
        using System.Collections.Generic;
        using System.ComponentModel;
        using System.Data;
        using System.Drawing;
        using System.Linq;
        using System.Text;
        using System.Windows.Forms;
        using System.Diagnostics;
        using System.Security.Principal;

        namespace WifiRouter
        {
            public partial class Form1 : Form
            {
                bool connect = false;
                public Form1()
                {

                    InitializeComponent();
                }

                public static bool IsAdmin()
                {
                    WindowsIdentity id = WindowsIdentity.GetCurrent();
                    WindowsPrincipal p = new WindowsPrincipal(id);
                    return p.IsInRole(WindowsBuiltInRole.Administrator);
                }
                public void RestartElevated()
                {
                    ProcessStartInfo startInfo = new ProcessStartInfo();
                    startInfo.UseShellExecute = true;
                    startInfo.CreateNoWindow = true;
                    startInfo.WorkingDirectory = Environment.CurrentDirectory;
                    startInfo.FileName = System.Windows.Forms.Application.ExecutablePath;
                    startInfo.Verb = "runas";
                    try
                    {
                        Process p = Process.Start(startInfo);
                    }
                    catch
                    {

                    }

                    System.Windows.Forms.Application.Exit();
                }
                private void button1_Click(object sender, EventArgs e)
                {
                    string ssid = textBox1.Text, key = textBox2.Text;
                    if (!connect)
                    {
                        if (String.IsNullOrEmpty(textBox1.Text))
                        {
                            MessageBox.Show("SSID cannot be left blank !",
                            "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        }
                        else
                        {

                            if (textBox2.Text == null || textBox2.Text == "")
                            {
                                MessageBox.Show("Key value cannot be left blank !",
                                "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            }
                            else
                            {
                                if (key.Length >= 6)
                                {
                                    Hotspot(ssid, key, true);
                                    textBox1.Enabled = false;
                                    textBox2.Enabled = false;
                                    button1.Text = "Stop";
                                    connect = true;
                                }
                                else
                                {
                                    MessageBox.Show("Key should be more then or Equal to 6 Characters !",
                                    "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                }
                            }
                        }
                    }
                    else
                    {
                        Hotspot(null, null, false);
                        textBox1.Enabled = true;
                        textBox2.Enabled = true;
                        button1.Text = "Start";
                        connect = false;
                    }
                }
                private void Hotspot(string ssid, string key,bool status)
                {
                    ProcessStartInfo processStartInfo = new ProcessStartInfo("cmd.exe");
                    processStartInfo.RedirectStandardInput = true;
                    processStartInfo.RedirectStandardOutput = true;
                    processStartInfo.CreateNoWindow = true;
                    processStartInfo.UseShellExecute = false;
                    Process process = Process.Start(processStartInfo);

                    if (process != null)
                    {
                        if (status)
                        {
                            process.StandardInput.WriteLine("netsh wlan set hostednetwork mode=allow ssid=" + ssid + " key=" + key);
                            process.StandardInput.WriteLine("netsh wlan start hosted network");
                            process.StandardInput.Close();
                        }
                        else
                        {
                            process.StandardInput.WriteLine("netsh wlan stop hostednetwork");
                            process.StandardInput.Close();
                        }
                    }
                }

                private void Form1_Load(object sender, EventArgs e)
                {
                    if (!IsAdmin())
                    {
                        RestartElevated();
                    }
                }

                private void Form1_FormClosing(object sender, FormClosingEventArgs e)
                {
                    Hotspot(null, null, false);
                    Application.Exit();
                }
            }
        }