具体如下：

string strxml = "121122111222";
DataSet ds = new DataSet();
Stream stream = new MemoryStream(Encoding.Default.GetBytes(strxml));
ds.ReadXml(stream);
GridView1.DataSource = ds;
GridView1.DataBind();

protected void Page_Load(object sender, EventArgs e)
{
  if (!IsPostBack)
  {
    DataSet ds = new DataSet();
    TextReader reader = new StringReader(@"
          
           
            The Chi-lites
            Soul
            A lonely man
            1972
           
           
            Babyface
            R&B
            unknown
            
           
           
            Babyface
            R&B
            The essential babyface
            2001
           
           
            Babyface
            R&B
            Grown and sexy
            2005
           
           
            Maria Arredondo
            Pop
            Not going under
            2004
           
           
            Leona Lewis
            Pop
            Unknown
            2008
           
           
            Usher
            R&B
            Usher
            2008
           
           
            Christina Aguilera
            Blues
            Back to basics
            2004
           
           
            Sting
            Pop
            Shape of my heart
            
           
          
          ");
    //读取Xml字符串 用来接收WebService返回数据
    ds.ReadXml(reader, XmlReadMode.Auto);
    //生成Xml文件
    //ds.WriteXml(Server.MapPath("xml/song_bak.xml"));
    GridView1.DataSource = ds;
    GridView1.DataBind();
  }
}

#region 接口返回的Xml转换成DataSet
/// 

/// 返回的Xml转换成DataSet
/// 
/// Xml字符
/// 
private DataSet GetDataSet(string text)
{
  try
  {
    XmlTextReader reader = new XmlTextReader(new StringReader(text));
    reader.WhitespaceHandling = WhitespaceHandling.None;
    DataSet ds = new DataSet();
    ds.ReadXml(reader);
    reader.Close();
    ds.Dispose();
    return ds;
  }
  catch
  {
    return null;
  }
}
#endregion
#region 后台提交数据且获取接口返回的数据
/// 

/// 后台提交数据且获取接口返回的数据
/// 
/// 地址
/// 
public static string GetRequestString(string relativePath)
{
  string requestUrl = relativePath;
  try
  {
    // 创建一个HTTP请求
    HttpWebRequest request = (System.Net.HttpWebRequest)WebRequest.Create(requestUrl);
    request.Method = "GET";
    StreamReader jsonStream = new StreamReader(request.GetResponse().GetResponseStream());
    string jsonObject = jsonStream.ReadToEnd();
    return jsonObject;
  }
  catch
  {
    return string.Empty;
  }
}
#endregion