Need Multiple Generic Types (List<A or B>)

interface ILetter
{
	void IsLetter();
}
 
interface Alphabet : ILetter
{
	void IsAlpha();
}
 
class A : Alphabet
{
	#region Alphabet Members
 
	public void IsAlpha()
	{
		throw new NotImplementedException();
	}
 
	#endregion
 
	#region ILetter Members
 
	public void IsLetter()
	{
		throw new NotImplementedException();
	}
 
	#endregion
}
 
class B : Alphabet
{
	#region Alphabet Members
 
	public void IsAlpha()
	{
		throw new NotImplementedException();
	}
 
	#endregion
 
	#region ILetter Members
 
	public void IsLetter()
	{
		throw new NotImplementedException();
	}
 
	#endregion
}
 
static main()
{
	List<A> sample1 = new List<A>();
	List<B> sample2 = new List<B>();
}

                                              

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class ILetterAorB<T> : IList<T>
	where T : Alphabet
{
	List<T> list;
 
	public ILetterAorB()
	{
		list = new List<T>();
	}
 
	#region IList<T> Members
 
	public int IndexOf(T item)
	{
		list.IndexOf(item);
	}
 
	public void Insert(int index, T item)
	{
		list.Insert(index, item);
	}
 
	public void RemoveAt(int index)
	{
		throw new NotImplementedException();
	}
 
	public T this[int index]
	{
		get
		{
			throw new NotImplementedException();
		}
		set
		{
			throw new NotImplementedException();
		}
	}
 
	#endregion
 
	#region ICollection<T> Members
 
	public void Add(T item)
	{
		throw new NotImplementedException();
	}
 
	public void Clear()
	{
		throw new NotImplementedException();
	}
 
	public bool Contains(T item)
	{
		throw new NotImplementedException();
	}
 
	public void CopyTo(T[] array, int arrayIndex)
	{
		throw new NotImplementedException();
	}
 
	public int Count
	{
		get { throw new NotImplementedException(); }
	}
 
	public bool IsReadOnly
	{
		get { throw new NotImplementedException(); }
	}
 
	public bool Remove(T item)
	{
		throw new NotImplementedException();
	}
 
	#endregion
 
	#region IEnumerable<T> Members
 
	public IEnumerator<T> GetEnumerator()
	{
		throw new NotImplementedException();
	}
 
	#endregion
 
	#region IEnumerable Members
 
	IEnumerator IEnumerable.GetEnumerator()
	{
		throw new NotImplementedException();
	}
 
	#endregion
}

                                              

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