C#格式化XML输出

自已用程序拼装的xml串，虽然格式是正确的，但输出时阅读极不方便。采用下面函数可以格式化xml输出，效果和在浏览器中一样

private string FormatXml(string sUnformattedXml)
        {
            XmlDocument xd = new XmlDocument();
            xd.LoadXml(sUnformattedXml);
            StringBuilder sb = new StringBuilder();
            StringWriter sw = new StringWriter(sb);
            XmlTextWriter xtw = null;
            try
            {
                xtw = new XmlTextWriter(sw);

                xtw.Formatting = Formatting.Indented;
                xtw.Indentation = 1;
                xtw.IndentChar='\t';

                xd.WriteTo(xtw);
            }
            finally
            {
                if (xtw != null)
                    xtw.Close();
            }
            return sb.ToString();
        }