using System;

using System.Runtime.Serialization;

public class Program

{

    public static void Main()

    {

        throw new CustomerNotFoundException();

    }

    [Serializable]

    public class CustomerNotFoundException : Exception

    {

        public CustomerNotFoundException() 

            : base() 

        {

        }

        public CustomerNotFoundException(string message) 

            : base(message) 

        {

        }

        public CustomerNotFoundException(string message, Exception innerException) 

            : base(message, innerException) 

        {

        }

        protected CustomerNotFoundException(SerializationInfo info, StreamingContext context) 

            : base(info, context) 

        {

        }

    }

}