why can you prove that string is immutable datatype while StringBuilder is Mutable Datatype ?

Answer:

Hi All

We can prove this by using Object.GetHashCode () Method provided in super class of all .net langues..

The hash code is a numeric value that is used to identify an object..

Please refer the below line of code..

using System;

using System.Text;



  class Program

    {

        static void Main(string[] args)

        {

            string strtemp ="Prad";

            Console.WriteLine(strtemp +"            "+ strtemp.GetHashCode());



            strtemp = strtemp + "eep";

            Console.WriteLine(strtemp +"      "+strtemp.GetHashCode());



            StringBuilder sb = new StringBuilder("Prad");

            Console.WriteLine(sb + "            " + sb.GetHashCode());



            sb.Append("eep");

            Console.WriteLine(sb + "      " + sb.GetHashCode());

        }

    }



/*output 

Prad      432992021

Pradeep  -673750172

Prad      46104728

Pradeep   46104728 */

As we can see for any operation performed on the string the new memory is created that y it is called immutable..

while for stringbuilder for all the operation the same memory is being modified.. as we can see the hashcode both time is same.

Happy coding :-)