using System;

using System.Globalization;

public class Program

{

    public static void Main()

    {       

        Console.WriteLine(new CustomException().ToString());

    }   

}

​

public class CustomException : Exception

{

    public override string ToString()

    {

        return "An exception occurred while processing the request. (ErrorMessage: The operation has timed out). Error: . Description: ";

    }

}

​

​