using System;
using System.Collections.Generic;
class Program
{
static void Main(string[] args)
{
List boxes = new List();
boxes.Add(new Box(8, 8, 4));
boxes.Add(new Box(8, 4, 8));
boxes.Add(new Box(8, 6, 4));
if (boxes.Contains(new Box(8, 6, 4)))
{
Console.WriteLine("An equal box is already in the collection.");
}
else
{
Console.WriteLine("Box can be added.");
}
}
}
public class Box : IEquatable
{
public Box(int h, int l, int w)
{
this.Height = h;
this.Length = l;
this.Width = w;
}
public int Height { get; set; }
public int Length { get; set; }
public int Width { get; set; }
public bool Equals(Box other)
{
if (this.Height == other.Height && this.Length == other.Length
&& this.Width == other.Width)
{
return true;
}
else
{
return false;
}
}
}