using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(new Teste2().AnyMethod(1, 2));

        Console.WriteLine(new Teste2().AnyMethod(1, 2, 3));

        Console.WriteLine(new Teste2().AnyMethod(1, 2, 3, 4));

    }

}

​

public abstract class Teste 

{

    public virtual int AnyMethod(params int[] lista)

    {

        throw new NotImplementedException ( "This method is not implemented" );

    }

}

​

public class Teste2: Teste

{

    public override int AnyMethod(params int[] lista)

    {

        return lista.Sum(x => x);

    }

    public int AnyMethod(int a, int b) 

    {

        return AnyMethod(new int[] {a, b});

    }

    public new int AnyMethod(int a, int b, int c) 

    {

        Console.WriteLine("Exemplo do new");

        return a + b + c;

    }

}