using System;

using System.Collections.Generic;

using System.Linq;

​

class Review

{

    public int Score { get; set; }

}

​

public class Program

{

    public static void Main(string[] args)

    {

        var reviews = new List<Review>();

​

        if (reviews.All(r => r.Score < 0))

            throw new Exception("Alert manager");

    }

}

​