Difference between Convert.ToString () and .ToString () or Convert.ToString vs ToString c# or Convert.ToString vs .toString()

Step 1:- Explanation 

1.  .ToString () doesn't handle the null value. 

2.  Convert.ToString() handles null value.

Step 2:-  .ToString() 

using System;

namespace ToString

{

    public class Program

    {

        static void Main(string[] args)

        {

            Object obj = null;

            string value1 = obj.ToString(); //Error

            Console.WriteLine(value1);

            Console.ReadLine();

        }

    }

}

Step 3:-  Output

Step 4:-  Convert.ToString() 

using System;

namespace ConvertDotToString

{

    public class Program

    {

        static void Main(string[] args)

        {

            Object obj = null;

            string value1 = Convert.ToString(obj); //Return Null Or Blank

            Console.WriteLine(value1);

            Console.ReadLine();

        }

    }

}

Step 5:- Output