Can System.Net.Mail.Mailmessage be inherited?

Question

I tried to inherit from mailmessage class, but I can't. I want to introduce my own properties in it.

When I type public override , I don't get any override options

here my code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net.Mail;

namespace FoodMenu
{
    public class CustomMailMessage:MailMessage
    {

    }
}

Answer 1

No doubt this class can be inherited as there is no sealed keyword in its declaration.

public class MailMessage : IDisposable

May be there is no property that can be overrided.