Binding dropdown through arraylist

<asp:DropDownList ID="dropCountries" runat="server">
        </asp:DropDownList>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            BindDropDown();
            dropCountries.DataSource = BindDropDown();
            dropCountries.DataBind();
            dropCountries.Items.Insert(0, new ListItem("--Select--", ""));
        }

    }

    private object BindDropDown()
    {
        ArrayList arCountries = new ArrayList();
        arCountries.Add("INDIA");
        arCountries.Add("USA");
        arCountries.Add("UK");
        arCountries.Add("PAKISTHAN");
        return arCountries;
       
    }
}