using System.Collections; ArrayList al = new ArrayList(); al.Add("Monday"); al.Add("Tuesday"); al.Add("Wednesday"); foreach (string str in al) { ... }
int num = al.Count; //3
bool b = al.Contains("Monday"); //true
int num = al.IndexOf("Tuesday"); //1
al.Insert("Thursday"); //void al.Remove("Monday"); //void
using System.Collections; ArrayList al = new ArrayList(); al.Add(1); al.Add("Monday"); //will cause casting error later