利用WebClient获取远程数据（仅做备份）

              public DataSet GetData(string httpUrl)
              {
                     string xmlPath = @"http地址"; // 该地址不能包含中文
                     DataSet ds = new DataSet();
                     WebClient wc = new WebClient();
                     byte[] bt = wc.DownloadData(xmlPath); 

                     XmlDocument xd = new XmlDocument();

                     string source = Byte2String(bt);

                     xd.LoadXml(source);

                     XmlNodeReader xnr = new XmlNodeReader(xd);

                     ds.ReadXml(xnr);

                     DataTable dt = ds.Tables[0];

                     this.DataGrid1.DataSource = ds;

                     this.DataGrid1.DataBind(); 
   

                     return ds;  

              }

              public static string Byte2String(byte[] bt)

              {

                     System.Text.Encoding encoding = System.Text.Encoding.GetEncoding("gb2312");

                     string str = encoding.GetString(bt);

                     return str;