How to Call UserControl Method From Parent Page

How to Call UserControl Method From Parent Page:


ASP.uc_organisation_ascx objUC;

objUC = Page.FindControl("Organisation1") as ASP.uc_organisation_ascx;
if (objUC != null)
{
objUC.FillEmployeeNames(Session["PROJECT_ID"].ToString());
}

//FillEmployeeNames is the Method name in userControl