System.Xml.Xsl.Runtime.XsltLibrary.NumberFormat C# (CSharp) Method

        public string NumberFormat(IList<XPathItem> value, string formatString,
            double lang, string letterValue, string groupingSeparator, double groupingSize)
        {
            // REVIEW: For each execution of xsl:number new Format() object is created.
            // Then there is no AVTs we can build this object once and reuse it later to improve performance.
            NumberFormatter formatter = new NumberFormatter(formatString, (int)lang, letterValue, groupingSeparator, (int)groupingSize);
            return formatter.FormatSequence(value);
        }