AddingItems.cs

// Add elements using .Add() Method 
var myArrayList = new ArrayList();
myArrayList.Add(123);
myArrayList.Add("Freelancingcult.com");
myArrayList.Add(5.963);

// adding elements using object initializer syntax method
var myAraylist2 = new ArrayList()
                {
                    "Culure", 452, " ", true, 4.5, null
                };