A Simple C# List Made Simple

Jan 13, 2012 Under : .NET
Tags : .NET, C#

Yesterday, I’ve wrote in C#. I taken the code from the book.
List.cs

using System;
public class List
{
	const int defaultCapacity = 4;

	T[] items;
	int count;

	public List(int capacity = defaultCapacity)
	{
		items = new T[capacity];
	}

	public int Count
	{
		get{return count;}
	}

	public int Capacity
	{
		get{return items.Length;}
		set
		{
			if(value < count) value = count;
			if(value != items.Length)
			{
				T[] newItems = new T[value];
				Array.Copy(items, 0, newItems, 0, count);
				items = newItems;
			}
		}
	}

	public T this[int index]
	{
		get
		{
			return items[index];
		}
		set
		{
			items[index] = value;
			OnChanged();
		}
	}

	public void Add(T item)
	{
		if(count == Capacity) Capacity = count * 2;
		items[count] = item;
		count++;
		OnChanged();
	}

	protected virtual void OnChanged()
	{
		if(Changed != null) Changed(this, EventArgs.Empty);
	}

	public override int GetHashCode()
	{
		return this.GetHashCode();
	}

	public override bool Equals(object other)
	{
		return Equals(this, other as List);
	}

	static bool Equals(List a, List b)
	{
		for(int i = 0; i a, List b)
	{
		return Equals(a, b);
	}

	public static bool operator !=(List a, List b)
	{
		return !Equals(a, b);
	}
}

And here is the main entry code to test the code above.
Tests.cs

using System;

class Test
{
	static void Main()
	{
		List list1 = new List(5);
		List list2 = new List(10);

		Console.WriteLine(list1 == list2);
	}
}

In this code, I found two bugs that leads the program to run-time error or result error. Can you find it?