class Customer
{
	private string m_strName;
		
	public string Name
	{
		get { return m_strName; }
		set { m_strName = value; }
	}

	public Customer()
	{

	}

	public Customer(string Name)
	{
		m_strName = Name;
	}
}

/// 

/// This is a collection of Customer class
/// 

class Customers : CollectionBase
{
	public int Add(Customer item)
	{
		return List.Add(item);
	}

	public void Remove(Customer item)
	{
		List.Remove(item);
	} 

	public bool Contains(Customer item)
	{
		return List.Contains(item);
	}

	public int IndexOf(Customer item)
	{
		return List.IndexOf(item);
	}

	public void CopyTo(Customer[] array, int index)
	{
		List.CopyTo(array, index);
	}

	public Customer this[int index]
	{
		get { return (Customer)List[index]; }
		set { List[index] = value; }
	}
}

// How to use this Collection of class
Customer a1 = new Customer("Raj");
Customer a2 = new Customer("Vivek");
Customer a3 = new Customer("Parvin");
Customer a4 = new Customer("Taware");

Customers a = new Customers();
a.Add(a1);
a.Add(a2);
a.Add(a3);
a.Add(a4);

for(int i =0 ;i< a.Count;i++)
{
	MessageBox.Show(a[i].Name);
}