DataSet转换成IList类型

public IList<Point> GetAllPonitPage(int start, int limit)
        {
            string sql = "select top " + limit + "* from Led_Point where Id not in(select top " + start + " Id from Led_Point order by Id asc) order by Id asc";
            SqlDataAdapter sda = new SqlDataAdapter(sql, "server=.;uid=sa;pwd=sa;database=Led2010");
            DataSet ds = new DataSet();
            sda.Fill(ds);
            IList<Point> result = new List<Point>();
            for (int j = 0; j < ds.Tables[0].Rows.Count; j++)
            {
                Point _t = (Point)Activator.CreateInstance(typeof(Point));
                PropertyInfo[] propertys = _t.GetType().GetProperties();
                foreach (PropertyInfo pi in propertys)
                {
                    for (int i = 0; i < ds.Tables[0].Columns.Count; i++)
                    {
                        // 属性与字段名称一致的进行赋值
                        if (pi.Name.Equals(ds.Tables[0].Columns[i].ColumnName))
                        {
                            // 数据库NULL值单独处理
                            if (ds.Tables[0].Rows[j][i] != DBNull.Value)
                                pi.SetValue(_t, ds.Tables[0].Rows[j][i], null);
                            else
                                pi.SetValue(_t, null, null);
                            break;
                        }
                    }
                }
                result.Add(_t);
            }
            return result;
        }