Actually I'm using this code at universal app on the shared section 

```
using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;

namespace Tablaturas
{
    public class SeparadorDeSilabas
    {

        ArrayList posiciones; // Posiciones de inicio de las silabas
        String ultPal;        // Última palabra tratada, se guarda para
                              // no repetir el proceso si se pide la misma
    }
}

```

Now my problem is that **ArrayList** type resides at **System.Collections** But the compiler doesn't recognize it. 

How can I do to use ArrayList at universal app? **or**

There is another equivalent type for universal app?