Mono.Xml.XmlTextWriter.WriteCheckedBuffer C# (CSharp) Method

		void WriteCheckedBuffer (char [] text, int idx, int length)
		{
			int start = idx;
			int end = idx + length;
			while ((idx = XmlChar.IndexOfInvalid (text, start, length, true)) >= 0) {
				if (check_character_validity) // actually this is one time pass.
					throw ArgumentError (String.Format ("Input contains invalid character at {0} : &#x{1:X};", idx, (int) text [idx]));
				if (start < idx)
					writer.Write (text, start, idx - start);
				writer.Write ("&#x");
				writer.Write (((int) text [idx]).ToString (
					"X",
					CultureInfo.InvariantCulture));
				writer.Write (';');
				length -= idx - start + 1;
				start = idx + 1;
			}
			if (start < end)
				writer.Write (text, start, end - start);
		}