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sample:

using System;
using System.Linq;

namespace HelloWorld
{
    public class Person
    {
        // Constructor that takes no arguments:
        public Person()
        {
            Name = "unknown";
        }

        // Constructor that takes one argument:
        public Person(string name)
        {
            Name = name;
        }

        // Auto-implemented readonly property:
        public string Name { get; set; }

        // Method that overrides the base class (System.Object) implementation.
        public override string ToString()
        {
            return Name;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // Call the constructor that has no parameters.
            var person1 = new Person();
            Console.WriteLine(person1.Name);

            // Call the constructor that has one parameter.
            var person2 = new Person("Sarah Jones");
            Console.WriteLine(person2.Name);
            // Get the string representation of the person2 instance.
            var person3 = person2;
            person2.Name = "hello";
            Console.WriteLine(person3);

            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
}

console shows:

unknown
Sarah Jones
hello
Press any key to exit.

Tips:

Objects can be created by two ways.
first, using the new keyword followed by the name of the class that the object will be based on, like this:

var person1 = new Person();

and second like this:

 var person3 = person2;

This code creates two object references that both refer to the same object. Therefore, any changes to the object made through person2 are reflected in subsequent uses of person3 . Because objects that are based on classes are referred to by reference, classes are known as reference types.

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