如何指定asp.net 4.0中的chart的数据源

我用linq to sql指定了数据源
 
var myResult =  from s in faqs.Score
                                    where s.answerDate >= Convert.ToDateTime(txtStartDate.Text.Trim()) && s.answerDate <= Convert.ToDateTime(txtEndDate.Text.Trim())
                                          && s.Member.Group.Department.departmentID == Convert.ToInt32(dropDepartMent.SelectedItem.Value) 
                                          && s.scores >= 60
                                    group  s by s.Member.Group.groupName into g
                                    select new {
                                       xx =  g.Key,
                                       ff = faqs.Member.Count( x=> x.Group.groupName == g.Key ) / g.Count()
                                        };
                    
现在想用chart控件展示数据，如何指定?                    ChartScores.DataSource = myResult;
                    //下面这两行如何指定？
                    ChartScores.Series["?"].XValueMember = "xx";
                    ChartScores.Series["?"].YValueMembers = "ff";
                    ChartScores.DataBind();