using System;

using System.Collections.ObjectModel;

public class Program

{

    private static ObservableCollection<Host> _hostList = new ObservableCollection<Host>();

    public static void Main() {

        Init(5);

        foreach(Host h in _hostList){

            Console.WriteLine(h.Hostname + " (" + h.Hostinstance + ")");

        }

    }

    private static void Init(int i){

        for(int j = 0; j < i; j++){

            Host host = new Host();

            host.Hostinstance = NextHostInstance(1);

            _hostList.Add(host);

        }

    }

    private static string NextHostInstance(int i) {

      string inst = "nubbelig";

​

      if (_hostList.Count > 0) {

        foreach (Host host in _hostList) {

          if (host.Hostinstance.Equals("i" + i.ToString())) {

            inst = "exists";

          }

        }

      }

​

      if (inst.Equals("exists")) {

        inst = NextHostInstance(i + 1);

      } else {

        inst = "i" + i.ToString();

      }

​

      return inst;

    }

}

​

public class run{

}

​

public class Host{

    public string Hostname{get;set;}

    public string Hostkuerzel{get;set;}

    public string Hostbeschreibung{get;set;}

    public string Hostinstance{get;set;}

}