Visual Basic

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    ' Add a column to the listview
    ListView1.Columns.Add("Name")

    ' Create two groups
    ListView1.Groups.Add("Group1", "Group1")
    ListView1.Groups.Add("Group2", "Group2")

    ' Add two items and assign them to the desired group
    ListView1.Items.Add("Test Group1").Group = ListView1.Groups("Group1")
    ListView1.Items.Add("Test Group2").Group = ListView1.Groups("Group2")

    ' Add another item differently and give it a group
    ListView1.Items.Add(New ListViewItem("Test Group1 again", ListView1.Groups("Group1")))

    ListView1.View = View.Details

    ' Basically you need to know that the groups collection is where you
    ' add groups to the listview

    ' I've showed two different ways you can add an item and assign it to a group
    ' This should give you an idea how to work with groups
End Sub