private void GroupOtherQuery()

         {

             List<UserBaseInfo> users = new List<UserBaseInfo>();

             for(int i=;i<;i++)

             {

                 users.Add(new UserBaseInfo(i,"users0"+i.ToString(),"user0"+i.ToString()+"@web.com"));

             }

             var result = from u in users

                          group u by Int32.Parse(u.UserName.Substring(u.UserName.Length - )) %  ==  into g

                          where g.Count() < 

                          select g;

             foreach (var v in result)

             {

                 foreach (UserBaseInfo u in v)

                 {

                     Response.Write(u.UserName + "</br>");

                 }

             }

         }