无法在Listview中显示数据库表

Question

这是我第一次尝试在列表视图中显示我的表信息。这是我到目前为止所做的，我无法弄清楚它为什么不起作用。我没有收到任何错误，列表视图在运行时仍然是空白。

    listView1.Columns.Add("User", 100, HorizontalAlignment.Left);
    listView1.Columns.Add("Name", 100, HorizontalAlignment.Center);
    listView1.Columns.Add("Message", 382, HorizontalAlignment.Left);
    listView1.Columns.Add("Date/Time", 100, HorizontalAlignment.Left);

    listView1.View = View.Details;

    SqlConnection sqlConnection = new SqlConnection("ConnectionInfo");
    sqlConnection.Open();
    SqlDataAdapter ada = new SqlDataAdapter("select * FROM MPCS.MEYER_BOARD WHERE BOARD_NAME = '" + cmbgroup.Text + "'", sqlConnection);

    DataTable dt = new DataTable();
    ada.Fill(dt);

    for (int i = 0; i < dt.Rows.Count; i++)
    {
        DataRow dr = dt.Rows[i];
        ListViewItem listitem = new ListViewItem(dr["EMPLOYEE_ID"].ToString());
        listitem.SubItems.Add(dr["POST_DATE"].ToString());
        listitem.SubItems.Add(dr["BOARD_NAME"].ToString());
        listitem.SubItems.Add(dr["MESSAGE_TEXT"].ToString());
        listView1.Items.AddRange(new ListViewItem[] {listitem});
    }