namespace SomeNamespace
{
    using System;

    class CustomException : Exception
    {
        public CustomException()
            : base() { }

        public CustomException(string message)
            : base(message) { }

        public CustomException(string format, params object[] args)
            : base(string.Format(format, args)) { }

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

        public CustomException(string format, Exception innerException, params object[] args)
            : base(string.Format(format, args), innerException) { }
    }
}