C# Online Compiler | .NET Fiddle

using System;
using System.Collections;
using System.Collections.Generic;

public class Program
{
    public static void Main(string[] args)
    {
        // Simple initialization of an object
        Employee emp = new Employee()
        {
            ID = 6,
            FirstName = "Code",
            LastName = "Monkey",
            StartDate = DateTime.Now
        };
        Console.WriteLine(emp.GetType());

        // An array of strings
        var names = new string[] { "Code Moneky", "Scrum Master", "Product Owner", "Mr. Quality" };
        Console.WriteLine(names.GetType());

        // A simple Hashtable
        var ht = new Hashtable {
                { "Apple", 5 },
                { "Banana", 12 },
                { "Citrus", 6 },
            };
        Console.WriteLine(ht.GetType());

        // A simple Lookup/Dictionary
        var lookup = new Dictionary<string, string> {
                { "A", "Apple" },
                { "B", "Banana" },
                { "C", "Citrus" },
            };
        Console.WriteLine(lookup.GetType());

        // A Dictionary of Dictionaries
        var groceries = new Dictionary<string, Dictionary<string, int>> {
                { "Fruits", new Dictionary<string, int> { { "Apple", 5 }, { "Banana", 12 }, { "Citrus", 16 } } },
                { "Vegetables", new Dictionary<string, int> { { "Tomatoes", 4 }, { "Eggplant", 1 }, { "Bell Pepper", 4 } } },
            };
        Console.WriteLine(groceries.GetType());

        // A Simple KeyValuePair
        var pair = new KeyValuePair<int, Employee>(1,
            new Employee()
            {
                ID = 1,
                FirstName = "Code",
                LastName = "Monkey",
                StartDate = DateTime.Now
            }
        );
        Console.WriteLine(pair.GetType());

        // A collection of objects
        var collection = new ArrayList
            {
                emp,
                names,
                ht,
                lookup,
                groceries,
                pair
            };
        Console.WriteLine(collection.GetType());

        // A collection of string objects
        var colors = new List<string>
            {
                "red",
                "green",
                "blue",
                "orange",
                "yellow"
            };
        Console.WriteLine(colors.GetType());

        // Anonymous object
        var city = new
        {
            City = "Portland",
            State = "Oregon"
        };
        Console.WriteLine(city.GetType());
        Console.WriteLine(city.City + ", " + city.State);

        // Anonymous objects array
        var cities = new[]
        {
            new {
                City = "Portland",
                State = "Oregon"
            },

            new {
                City = "San Francisco",
                State = "California"
            },

            new {
                City = "Seattle",
                State = "Washington"
            },
        };
        Console.WriteLine(cities.GetType());
        Console.WriteLine(cities[1].GetType());
        Console.WriteLine(cities[2].City + ", " + cities[2].State);
    }
}

public class Employee
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime StartDate { get; set; }
}

 
using System;
using System.Collections;
using System.Collections.Generic;
​
public class Program
{
    public static void Main(string[] args)
    {
        // Simple initialization of an object
        Employee emp = new Employee()
        {
            ID = 6,
            FirstName = "Code",
            LastName = "Monkey",
            StartDate = DateTime.Now
        };
        Console.WriteLine(emp.GetType());
​
        // An array of strings
        var names = new string[] { "Code Moneky", "Scrum Master", "Product Owner", "Mr. Quality" };
        Console.WriteLine(names.GetType());
​
        // A simple Hashtable
        var ht = new Hashtable {