Hello again：）

I've tried your codes and I found that because you've bound to a wrong tags，and you should directly bind to group instead of element/@name，see mine：

XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(Request.MapPath("XMLFile1.xml"));
                XmlNodeList nodes = xmlDoc.SelectNodes("Koorabet/sport/group");
                rep.DataSource = nodes;
                rep.DataBind();