// C# Extension Method
// Doc: [url will be determined later]
// @nuget: Z.ExtensionMethods
using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
var list = new List<string> {"zA", "zB", "C"};
// C# Extension Method: ICollection<T> - ContainsAll
bool value1 = list.ContainsAll("zA", "zB"); // return true;
bool value2 = list.ContainsAll("zA", "2"); // return false;
Console.WriteLine(value1);
Console.WriteLine(value2);
}