Linq_All.cs

using System;
using System.Linq;

class Program
{
  static void Main(string[] args)
  {
    string[] text = {"ああ山","いい山","うう山","ええ山","おお山"};
    var linqAll = text.All(item => item.EndsWith("山"));
    Console.WriteLine(linqAll);
  }
}