With the grouping feature of the ListView control, you can display related sets of items in groups. These groups are separated on the screen by horizontal group headers that contain the group titles. You can use ListView groups to make navigating large lists easier by grouping items alphabetically, by date, or by any other logical grouping. The following image shows some grouped items.
ListView grouped items
To enable grouping, you must first create one or more groups either in the designer or programmatically. After a group has been defined, you can assign ListView items to groups. You can also move items from one group to another programmatically.
ListView groups are available only on Windows XP Home Edition, Windows XP Professional, Windows Server 2003 when your application calls the System.Windows.Forms.Application.EnableVisualStyles method. On earlier operating systems, any code relating to groups has no effect and the groups will not appear. For more information, see System.Windows.Forms.ListView.Groups.
To add groups
// Adds a new group that has a left-aligned header listView1.Groups.Add(new ListViewGroup("List item text", HorizontalAlignment.Left));
' Adds a new group that has a left-aligned header ListView1.Groups.Add(New ListViewGroup("Group 1", _ HorizontalAlignment.Left))
To remove groups
Removing a group does not remove the items within that group.
// Removes the first group in the collection. listView1.Groups.RemoveAt(0); // Clears all groups. listView1.Groups.Clear();
' Removes the first group in the collection. ListView1.Groups.RemoveAt(0) ' Clears all groups: ListView1.Groups.Clear()
To assign items to groups or move items between groups
Set the System.Windows.Forms.ListViewItem.Group property of individual items.
// Adds the first item to the first group listView1.Items.Group = listView1.Groups;
' Adds the first item to the first group ListView1.Items.Item(0).Group = ListView1.Groups(0)
ListView Control Overview
Windows XP Features and Windows Forms Controls
How to: Add and Remove Items with the Windows Forms ListView Control