Code to understand using System.Collections.ObjectModel.Collection<T> Class

ObjectModel.Collection.cs

using System;
using System.Linq;
using System.Collections;
using System.Collections.ObjectModel;

class MainClass {
  public static void Main (string[] args) {
    Console.WriteLine ("Hello World");
    Collection<int> intCollection = new Collection<int>();
    intCollection.Add(1);
    intCollection.Add(2);
    intCollection.Add(3);
    intCollection.Add(4);
    foreach(int num in intCollection)
    {
      Console.WriteLine(num);
    }
    //Spreading the ints in a comma separated string
    string intColl2str = string.Join(",", intCollection.ToArray());
    Console.WriteLine(intColl2str);
    Console.WriteLine("END");
  }
}

Run full code here: https://repl.it/@sin2akshay/ObjectModelCollectioncs

For details about the class, read: http://people.cs.aau.dk/~normark/oop-csharp/html/notes/collections_themes-list-sect.html

Difference from normal Collection: https://stackoverflow.com/questions/3118242/system-collections-vs-system-collections-objectmodel