User Defined Exception (Inherited from built-in Exception class), C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    
    class Error  : Exception
    {
        string errMsg;
        public Error()
        {
            
        }
        public Error(string msg) : base(msg)
        {
        }

public void showError()
        {
            errMsg = Message;
            Console.WriteLine("Error:" + errMsg);
        }
    }

public class Program
    {
        public static void Main(string[] args)
        {
            try
            {
              int a=5;
              int b=0;
              int c=a/b;
              Console.WriteLine("Division : " + c);
            }catch
            {
                Error er = new Error("Division not possible");
                er.showError();
            }
        }
    }
}

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Compilation time: 0,17 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 11 Mb, average nr of threads: 2