listview 控件中如何插入多条记录，每条记录含三个字段，记录是从数据库取出来的，在线等

使用数据绑定，又或者是直接循环读出记录集，然后添加到listview控件中，详细的楼主请查书或是MSDN。

while（dr.read()）
{
    listView1.Items.Add(dr[0].tostring());
}

用detail显示方式，先加Item，再加2个SubItem，这样看起来就是一条一条的记录了
详细方法略

            using (SqlConnection conn = new SqlConnection(ConStr))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.Connection = conn;//记得要初始化connection
                     = "select 供应商ID,公司名称,联系人姓名,联系人职务,地址 from 供应商";
                    conn.Open();
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        //List<供应商> cla = new List<供应商>();
                        
                        while (reader.Read())
                        {
                           
                            ListViewItem lvitem = new ListViewItem();
                            lvitem.SubItems[0].Text= reader.GetInt32(0).ToString();//供应商ID
                            lvitem.SubItems.Add(reader.GetString(1));//公司名称
                            lvitem.SubItems.Add(reader.GetString(2));//联系人姓名
                            lvitem.SubItems.Add(reader.GetString(3));/联系人职务
                            if (reader.IsDBNull(4))//判断是否为空值
                            {
                                lvitem.SubItems.Add("NULL");//地址
                            }
                            else
                            {
                                lvitem.SubItems.Add(reader.GetString(4));//地址
                            }
                            this.listView1.Items.Add(lvitem);