using System;

using System.Collections.Generic;

using System.Linq;

using System.Diagnostics;

public class Program

{

    public static void Main()

    {

        try

        {

        string test = null;

        test.ToUpper();

        }

        catch(NullReferenceException ex)

        {

            Console.WriteLine(ex.ToString());

            var line = (new StackTrace(ex, true)).GetFrame(0).GetFileLineNumber();

            Console.WriteLine("Line Number: {0}", line);

        }

​

    }

}