using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        var stringA = "Hello world!";

        var stringB = "Hello world!";

​

        Console.WriteLine(Object.ReferenceEquals(stringA, stringB));

        var builderForC = new StringBuilder("Hello world!");

        var stringC = builderForC.ToString();

​

        Console.WriteLine(Object.ReferenceEquals(stringA, stringC));

    }

}