Access Parent Control's Method from a Child Control

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;


namespace CodeProject.Sample
{
    public partial class ChildControl : System.Web.UI.UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        
        /// <summary>
        /// Here is the code to access the parent user control's method
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void btnChild_click(Object sender, EventArgs e)
        {
            ((AbstractUserControl)Parent).CallmeFromChildControl();        
        }
    
    }


}