SqlCommand com = new SqlCommand();
                com.Connection = conn;
                com.CommandText = " select *  from student ";
                SqlDataReader read = com.ExecuteReader();
                listView2.View = View.Details;
                listView2.FullRowSelect = true;
                if (read.Read())
                {
                    ListViewItem lv = new ListViewItem(read[0].ToString());
                    lv.SubItems.Add(read[1].ToString());
                    lv.SubItems.Add(read[2].ToString());
                    listView2.Items.Add(lv);
                }

//前台为何不显示数据

//感觉代码没问题