Sample difference between ToString() and Convert.ToString() through console application

Sample difference between ToString() and Convert.ToString() through console application

using System;

namespace ConsoleApplicationSample

{

    class Convert_Tostring

    {

        public static void Main()

        {

            #region x.toString()

            string s = "";

            object o = null;

            s = o.ToString();

            Console.Write(s.ToString());

            Console.ReadLine();

            //returns a null reference exception for s.

            #endregion

            #region Convert.toString()

            string s;

            object o = null;

            s = Convert.ToString(o);

            Console.Write(Convert.ToString(s));

            Console.ReadLine();

            //returns an empty string for s and does not throw an exception.

            #endregion

        }

    }

}

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