I guess, you are trying to find out the names and values of all attributes defined by the HtmlTextWriterAttribute. If it is so, below is a piece of code.

foreach (int val in Enum.GetValues (HtmlTextWriterAttribute))
{
	HtmlTextWriterAttribute enumVal = (HtmlTextWriterAttribute) val;
	string enumName = enumVal.ToString ();
}

Hope this helps

Regards

Ravi