Programmatically create a web site in IIS using C# and set port number

Try the following Code to Know the unUsed PortNo

        DirectoryEntry root = new DirectoryEntry("IIS://localhost/W3SVC");

        // Find unused ID PortNo for new web site
        bool found_valid_port_no = false;
        int random_port_no = 1;

        do
        {
            bool regenerate_port_no = false;
            System.Random random_generator = new Random();
            random_port_no = random_generator.Next(9000,15000);

            foreach (DirectoryEntry e in root.Children)
            {
                if (e.SchemaClassName == "IIsWebServer")
                {

                    int site_id = Convert.ToInt32(e.Name);
                    //For each detected ID find the port Number 

                     DirectoryEntry vRoot = new DirectoryEntry("IIS://localhost/W3SVC/" + site_id);
                     PropertyValueCollection pvcServerBindings = vRoot.Properties["serverbindings"];
                     String bindings = pvcServerBindings.Value.ToString().Replace(":", "");
                     int port_no = Convert.ToInt32(bindings);

                     if (port_no == random_port_no)
                    {
                        regenerate_port_no = true;
                        break;
                    }
                }
            }

            found_valid_port_no = !regenerate_port_no;
        } while (!found_valid_port_no);

        int newportId = random_port_no;

I have gone though all answer here and also tested. Here is the most clean smarter version of answer for this question. However this still cant work on IIS 6.0. so IIS 8.0 or above is required.

string domainName = "";
string appPoolName = "";
string webFiles = "C:\\Users\\John\\Desktop\\New Folder";
if (IsWebsiteExists(domainName) == false)
{
    ServerManager iisManager = new ServerManager();
    iisManager.Sites.Add(domainName, "http", "*:8080:", webFiles);
    iisManager.ApplicationDefaults.ApplicationPoolName = appPoolName;
    iisManager.CommitChanges();
}
else
{
    Console.WriteLine("Name Exists already"); 
}


public static bool IsWebsiteExists(string strWebsitename)
{
    ServerManager serverMgr = new ServerManager();
    Boolean flagset = false;
    SiteCollection sitecollection = serverMgr.Sites;
    flagset = sitecollection.Any(x => x.Name == strWebsitename);
    return flagset;
}

This simplified method will create a site with default binding settings, and also create the application pool if needed:

public void addIISApplication(string siteName, string physicalPath, int port, string appPoolName)
{
    using (var serverMgr = new ServerManager())
    {
        var sitecollection = serverMgr.Sites;
        if (!sitecollection.Any(x => x.Name.ToLower() == siteName.ToLower()))
        {
            var appPools = serverMgr.ApplicationPools;
            if (!appPools.Any(x => x.Name.ToLower() == appPoolName.ToLower()))
            {
               serverMgr.ApplicationPools.Add(appPoolName);
            }

            var mySite = serverMgr.Sites.Add(siteName, physicalPath, port);
            mySite.ApplicationDefaults.ApplicationPoolName = appPoolName;
            serverMgr.CommitChanges();
        }
    }
}