C#实现XML与DataTable互转

C#中XML与datatable互换的两个函数：

    private string ConvertDataTableToXML(DataTable xmlDS)
    {
        MemoryStream stream = null;
        XmlTextWriter writer = null;
try
        {
            stream = new MemoryStream();
            writer = new XmlTextWriter(stream, Encoding.Default);
            xmlDS.WriteXml(writer);
int count = (int)stream.Length;
byte[] arr = new byte[count];
            stream.Seek(0, SeekOrigin.Begin);
            stream.Read(arr, 0, count);
            UTF8Encoding utf = new UTF8Encoding();
return utf.GetString(arr).Trim();
        }
catch
        {
return String.Empty;
        }
finally
        {
if (writer != null) writer.Close();
        }
    } 
private DataSet ConvertXMLToDataSet(string xmlData)
    {
      StringReader stream = null;
      XmlTextReader reader = null;
try
      {
        DataSet xmlDS = new DataSet();
        stream = new StringReader(xmlData);
        reader = new XmlTextReader(stream);
        xmlDS.ReadXml(reader);
return xmlDS;
      }
catch (Exception ex)
      {
string strTest = ex.Message;
return null;
      }
finally
      {
if (reader != null)
        reader.Close();
      }
    }