public XmlDataDocument GetSiteAData(string AssignName) {
XmlDataDocument xd = new XmlDataDocument();
DataSet ds = BusinessWork.BusinessWorkDataSet("TreeView1");
xd = new XmlDataDocument(ds);
XmlNode root1 = xd.DocumentElement;
XmlNodeList roots = root1.SelectNodes("url");
foreach (XmlNode roota in roots) //为所有元素加上站点名称标记 {
XmlElement Link = xd.CreateElement("SiteName");
Link.InnerText = ConfigurationSettings.AppSettings["SiteName"].ToString();
roota.AppendChild(Link);
}
return xd;
}

IAsyncResult ar1;
IAsyncResult ar2;
localhost.WebService serviceA = new localhost.WebService();
XmlNode xmlNode1;
XmlNode xmlNode2;
////直接调用 //xmlNode1 = serviceA.GetSiteAData("2");
//异步调用 ar1 = serviceA.BeginGetSiteAData("3", null, null);
ar2 = serviceA.BeginGetSiteAData("2", null, null);
xmlNode1 = serviceA.EndGetSiteAData(ar1);
xmlNode2 = serviceA.EndGetSiteAData(ar2);
StringBuilder xmlString1;
xmlString1 = new StringBuilder(xmlNode1.OuterXml);
XmlDataDocument xd = new XmlDataDocument();
xd.LoadXml(xmlString1.ToString());
DataSet ds = new DataSet();
ds.ReadXml(new XmlNodeReader(xd));
GridView1.DataSource = ds.Tables[0];
GridView1.DataBind();