using exception.ToString - sync code

Program.cs

using System;
using System.IO;
using System.Threading;

namespace ConsoleApplication10
{
    class Program
    {
        static void Main(string[] args)
        {
            string filePath = null; // should have been set to something, but wasn't
            try
            {
                var result = ReadData(filePath);
                Console.WriteLine("Result is {0}", result);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception happened - Message = {0}

", ex.Message);
                Console.WriteLine("Exception happened - StackTrace = {0}

", ex.StackTrace);
                Console.WriteLine("Exception happened - ToString() = {0}

", ex);
            }
        }
        public static int ReadData(string filePath)
        {
            try
            {
                // do other stuff
                Thread.Sleep(1000);

                var readDataImpl = ReadDataImpl(filePath);
                return readDataImpl;
            }
            catch (Exception ex)
            {
                throw new MyException("I just don't know what went wrong!", ex);
            }
        }

        public static int ReadDataImpl(string filePath)
        {
            try
            {
                var readAllBytes = File.ReadAllBytes(filePath);
                var length = readAllBytes.Length;
                return length;
            }
            catch (Exception ex)
            {
                throw new MyException("Exception during File.ReadAllBytes - My bad!", ex);
            }
        }

        public class MyException : Exception
        {
            public MyException(string message, Exception innerException) : base(message, innerException) { }
        }
    }
}