public object GetDataSource(NameValueCollection args, bool designTime) { var users = new Users(); users.Add(new User { FirstName = "RuleePlus", LastName = "Chen", Role = new Role { Group = "R&D" }, Roles = new Roles { new Role { Group = "Yundang" } }, }); var ds = new ObjectDataSource(); ds.DataSource = users; ds.Fill(); return(ds); }