Visual Studio problem ? Or a my problem ?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Inizio
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World");
            Console.ReadLine();
        }



    }
}

I wrote this really simple code on visual studio but it doesn't show me anything in the console ! How can i solve it ? When i press F11 it gives me an error in the 12 line that is the first brace of the "static void Main(string[] args" function .