public faculty SearchFaculty(string id)
        {
            faculty t = null;

            foreach (faculty f in faculties)
            {
                if (f.Id.Equals(id))
                {
                    t = f;
                }
            }
            return(t);
        }
        static void Main(string[] args)
        {
            faculty    f1 = new faculty("Tanvir Ahmed", "234566");
            faculty    f2 = new faculty("Kaniz Fatema", "098654");
            department d1 = new department("CSE", "1234");

            d1.ShowInfo();
            d1.AddFaculty(f1, f2);
            d1.ShowAllFaculties();


            var faculty = d1.SearchFaculty("234566");

            if (faculty != null)
            {
                d1.DelateFaculty(faculty);
            }
            Console.WriteLine("delated");
            d1.ShowAllFaculties();
        }
 public void DelateFaculty(faculty f)
 {
     faculties.Remove(f);
 }