C#如何將XmlDocument轉化為string函數

/// <summary>  
       /// 將XmlDocument轉化為string  
       /// </summary>  
       /// <param name="xmlDoc"></param>  
       /// <returns></returns>  
       public string ConvertXmlToString(XmlDocument xmlDoc)  
       {  
           MemoryStream stream = new MemoryStream();  
           XmlTextWriter writer = new XmlTextWriter(stream, null);  
           writer.Formatting = Formatting.Indented;  
           xmlDoc.Save(writer);   
    StreamReader sr = new StreamReader(stream, System.Text.Encoding.UTF8);  
           stream.Position = 0;  
           string xmlString = sr.ReadToEnd();  
           sr.Close();  
           stream.Close();   
    return xmlString;  
       }

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