public void TestDefaultConstructor()
{
SmtpException se = new SmtpException();
Assert.NotNull(se.Data);
Assert.Equal(0, se.Data.Keys.Count);
Assert.Null(se.InnerException);
Assert.NotNull(se.Message);
Assert.Equal(-1, se.Message.IndexOf(typeof(SmtpException).FullName));
Assert.Equal(SmtpStatusCode.GeneralFailure, se.StatusCode);
}