GET SiteName , ApplicationPoolName From IIS

You are looking for ServerManager (Microsoft.Web.Administration) which provides read and write access to the IIS 7.0 configuration system.

(FIND in Forlder : C:\Windows\System32\inetsrv )

// Snippet        
using (ServerManager serverManager = new ServerManager()) { 

var sites = serverManager.Sites; 
foreach (Site site in sites) { 
         Console.WriteLine(site.Name); // This will return the WebSite name
}

You can also use LINQ to query the ServerManager.Sites collection (see example below)

// Start all stopped WebSites using the power of Linq :)
var sites = (from site in serverManager.Sites 
            where site.State == ObjectState.Stopped 
            orderby site.Name 
            select site); 

        foreach (Site site in sites) { 
            site.Start(); 
        }

Note : Microsoft.Web.Administration works only with IIS7.

And  RUN VisualStudio  with RUN AS ADMINISTRATOR

===

Với  ApplicationPool

 using (ServerManager serverManager = new ServerManager())
            {
                var appPools = serverManager.ApplicationPools;

      foreach (ApplicationPool appPool in appPools)
                {
                    Console.WriteLine(appPool.Name)

                }

}