如何在c＃中显示listview的行信息？

Question

我有一个关于c＃的列表视图但是我想要的是当我选择一行时它应该在消息框上显示该行的第1列值

private void CreateMyListView()
        {
            // Create a new ListView control.
            //ListView listView1 = new ListView();
            //listView1.Bounds = new Rectangle(new Point(10, 10), new Size(300, 200));

            // Set the view to show details.
            listView1.View = View.Details;
            // Allow the user to edit item text.
            listView1.LabelEdit = true;
            // Allow the user to rearrange columns.
            listView1.AllowColumnReorder = true;
            // Display check boxes.
            listView1.CheckBoxes = true;
            // Select the item and subitems when selection is made.
            listView1.FullRowSelect = true;
            // Display grid lines.
            listView1.GridLines = true;
            // Sort the items in the list in ascending order.
            listView1.Sorting = SortOrder.Ascending;

            // Create three items and three sets of subitems for each item.
            ListViewItem item1 = new ListViewItem("item1", 0);
            // Place a check mark next to the item.
            item1.Checked = true;
            item1.SubItems.Add("1");
            item1.SubItems.Add("2");
            item1.SubItems.Add("3");
            ListViewItem item2 = new ListViewItem("item2", 1);
            item2.SubItems.Add("4");
            item2.SubItems.Add("5");
            item2.SubItems.Add("6");
            ListViewItem item3 = new ListViewItem("item3", 0);
            // Place a check mark next to the item.
            item3.Checked = true;
            item3.SubItems.Add("7");
            item3.SubItems.Add("8");
            item3.SubItems.Add("9");

            // Create columns for the items and subitems.
            // Width of -2 indicates auto-size.
            listView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left);
            listView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left);
            listView1.Columns.Add("Column 3", -2, HorizontalAlignment.Left);
            listView1.Columns.Add("Column 4", -2, HorizontalAlignment.Center);

            //Add the items to the ListView.
            listView1.Items.AddRange(new ListViewItem[] { item1, item2, item3 });

            // Create two ImageList objects.
            ImageList imageListSmall = new ImageList();
            ImageList imageListLarge = new ImageList();
            // Initialize the ImageList objects with bitmaps.
            //imageListSmall.Images.Add(Bitmap.FromFile("C:\\MySmallImage1.bmp"));
            //imageListSmall.Images.Add(Bitmap.FromFile("C:\\MySmallImage2.bmp"));
            //imageListLarge.Images.Add(Bitmap.FromFile("C:\\MyLargeImage1.bmp"));
            //imageListLarge.Images.Add(Bitmap.FromFile("C:\\MyLargeImage2.bmp"));

            //Assign the ImageList objects to the ListView.
            listView1.LargeImageList = imageListLarge;
            listView1.SmallImageList = imageListSmall;

            // Add the ListView to the control collection.
            this.Controls.Add(listView1);
        }

那么有什么东西可以帮助我从列表视图中显示该行的第1列值吗？