Read dataset

        private DataSet XmlString2DataSet(string xmlString)
        {
            //create a new DataSet that will hold our values
            DataSet quoteDataSet = null;

            //check if the xmlString is not blank
            if (String.IsNullOrEmpty(xmlString))
            {
                //stop the processing
                return quoteDataSet;
            }

            try
            {
                //create a StringReader object to read our xml string
                using (StringReader stringReader = new StringReader(xmlString))
                {
                    //initialize our DataSet
                    quoteDataSet = new DataSet();

                    //load the StringReader to our DataSet
                    quoteDataSet.ReadXml(stringReader);
                }
            }
            catch
            {
                //return null
                quoteDataSet = null;
            }

            //return the DataSet containing the stock information
            return quoteDataSet;
        }