AddingAppPool

using System;
using Microsoft.Web.Administration;

class Program
{
  static void Main(string[] args)
  {
    ServerManager mgr = new ServerManager();
    ApplicationPool myAppPool = mgr.ApplicationPools.Add("MyAppPool");
    myAppPool.AutoStart = true;
    myAppPool.Cpu.Action = ProcessorAction.KillW3wp;
    myAppPool.ManagedPipelineMode = ManagedPipelineMode.Integrated;
    myAppPool.ManagedRuntimeVersion = "V2.0";
    myAppPool.ProcessModel.IdentityType = ProcessModelIdentityType.NetworkService;
    myAppPool.ProcessModel.IdleTimeout = TimeSpan.FromMinutes(2);
    myAppPool.ProcessModel.MaxProcesses = 1;
    mgr.CommitChanges();
  }
}