I want vb.net code to allow users to select only one option in the listview item,

Private Sub btnContinue_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnContinue.Click
        'Private Sub btnContinue_Click(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ListViewItemSelectionChangedEventArgs) Handles btnContinue.Click
        Dim lvi As ListViewItem = Nothing
       
        Dim _optionsHTML As String = "<ul>"
        Dim _options As String = ""
        Dim i As Integer = 0

        For Each lvi In lvCancellationOptions.Items
            

            If lvi.Checked Then

                _optionsHTML &= "<li>" & lvi.Text & "</li>"
                _options &= lvi.Text & vbCrLf
                i += 1

            End If

        Next

        _optionsHTML &= "</ul>"

        If (i = 0) Then

            MessageBox.Show("You must select at least one cancellation option")

        Else

            RaiseEvent ContinueCancellation(True, _optionsHTML, _options)
            Me.Close()

        End If

    End Sub