anche così:
codice:
using System;
using System.Collections.Generic;
using System.Text;

namespace Program1
{
    public class Class1
    {
        public static void Duplicati()
        {
            int num;
            int[] sequenza = new int[5];
            for(int i = 0; i < sequenza.Length; i++)
            {
                Console.WriteLine("Scrivi numero: ");
                Console.ReadLine(sequenza[i]);
            }
        }
    }
}
e
codice:
using System;
using System.Collections.Generic;
using System.Text;
using Class1

namespace Program1
{
    public class Program1
    {
        public static void Main()
        {
            Class1 oggetto = new Class1();
            oggetto.Duplicati();
        }
    }
}
mi da:
The type or namespace name 'Class1' could not be found (are you missing a using directive or an assembly reference?)