List<T>做数据源绑定的问题

 List<C_Pinpai> lc;// = new List<C_Pinpai>();
        private void BindGrid()
        {
            //if (lc.Count > 0)
            //    lc.Clear();
            lc = new List<C_Pinpai>();
            
            if (Xml_Data.CoreDS.Tables["Product"].Rows.Count > 0)
            {
                foreach (DataRow dr in Xml_Data.CoreDS.Tables["Product"].Rows)
                {
                    C_Pinpai c_pinpai = new C_Pinpai();
                    c_pinpai.Id = int.Parse(dr["id"].ToString());
                    c_pinpai.Isselect = false;
                    c_pinpai.PinpaiInfo = dr["productinfo"].ToString();
                    c_pinpai.IsCanUse = dr["iscanuse"].ToString();

                    lc.Add(c_pinpai);
                }
               // MessageBox.Show(Xml_Data.CoreDS.Tables["Product"].Rows.Count.ToString());
                cDataGridView1.DataSource = lc;
            }

            cDataGridView1.Refresh();
        }