怎么把treeview和listview连接起来啊

C# 复制代码
void treeView1_NodeMouseClick(object sender,
TreeNodeMouseClickEventArgs e)
{
TreeNode newSelected = e.Node;
listView1.Items.Clear();
DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;
ListViewItem.ListViewSubItem[] subItems;
ListViewItem item = null;

foreach (DirectoryInfo dir in nodeDirInfo.GetDirectories())
{
item = new ListViewItem(dir.Name, 0);
subItems = new ListViewItem.ListViewSubItem[]
{new ListViewItem.ListViewSubItem(item, "Directory"),
new ListViewItem.ListViewSubItem(item,
dir.LastAccessTime.ToShortDateString())};
item.SubItems.AddRange(subItems);
listView1.Items.Add(item);
}
foreach (FileInfo file in nodeDirInfo.GetFiles())
{
item = new ListViewItem(file.Name, 1);
subItems = new ListViewItem.ListViewSubItem[]
{ new ListViewItem.ListViewSubItem(item, "File"),
new ListViewItem.ListViewSubItem(item,
file.LastAccessTime.ToShortDateString())};

item.SubItems.AddRange(subItems);
listView1.Items.Add(item);
}

listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);
}

我将这些添加后运行,出现错误说是不是缺少using命令
这是怎么会事啊