VB.NET: How to sort listview by clicked column

Ok, I claim no credit for this whatsoever, but just in case Fryan Valdez ever takes down his blog I'll repost the information in his blog post here:

Please click through to read the original blog, I provide a copy of it here purely for my information and future reference

http://www.fryan0911.com/2009/05/vbnet-how-to-sort-listview-by-clicked.html

To make your ListView application capable of column sorting, follow these steps:

1. On your existing project, add a new class with following code:

Public Class clsListviewSorter ' Implements a comparer
    Implements IComparer
    Private m_ColumnNumber As Integer
    Private m_SortOrder As SortOrder
    Public Sub New(ByVal column_number As Integer, ByVal sort_order As SortOrder)
        m_ColumnNumber = column_number
        m_SortOrder = sort_order
    End Sub
    ' Compare the items in the appropriate column
    Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
        Dim item_x As ListViewItem = DirectCast(x, ListViewItem)
        Dim item_y As ListViewItem = DirectCast(y, ListViewItem)
        ' Get the sub-item values.
        Dim string_x As String
        If item_x.SubItems.Count <= m_ColumnNumber Then
            string_x = ""
        Else
            string_x = item_x.SubItems(m_ColumnNumber).Text
        End If
        Dim string_y As String
        If item_y.SubItems.Count <= m_ColumnNumber Then
            string_y = ""
        Else
            string_y = item_y.SubItems(m_ColumnNumber).Text
        End If
        ' Compare them.
        If m_SortOrder = SortOrder.Ascending Then
            If IsNumeric(string_x) And IsNumeric(string_y) Then
                Return Val(string_x).CompareTo(Val(string_y))
            ElseIf IsDate(string_x) And IsDate(string_y) Then
                Return DateTime.Parse(string_x).CompareTo(DateTime.Parse(string_y))
            Else
                Return String.Compare(string_x, string_y)
            End If
        Else
            If IsNumeric(string_x) And IsNumeric(string_y) Then
                Return Val(string_y).CompareTo(Val(string_x))
            ElseIf IsDate(string_x) And IsDate(string_y) Then
                Return DateTime.Parse(string_y).CompareTo(DateTime.Parse(string_x))
            Else
                Return String.Compare(string_y, string_x)
            End If
        End If
    End Function
End Class

2. Declare a private variable on the form where the listview you want to be sorted is located.

Private m_SortingColumn As ColumnHeader

3. Then on the listview's ColumnClick event, add the following code

Private Sub ListView1_ColumnClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ColumnClickEventArgs) Handles ListView1.ColumnClick
        ' Get the new sorting column.
        Dim new_sorting_column As ColumnHeader = ListView1.Columns(e.Column)
        ' Figure out the new sorting order.
        Dim sort_order As System.Windows.Forms.SortOrder
        If m_SortingColumn Is Nothing Then
            ' New column. Sort ascending.
            sort_order = SortOrder.Ascending
        Else ' See if this is the same column.
            If new_sorting_column.Equals(m_SortingColumn) Then
                ' Same column. Switch the sort order.
                If m_SortingColumn.Text.StartsWith("> ") Then
                    sort_order = SortOrder.Descending
                Else
                    sort_order = SortOrder.Ascending
                End If
            Else
                ' New column. Sort ascending.
                sort_order = SortOrder.Ascending
            End If
            ' Remove the old sort indicator.
            m_SortingColumn.Text = m_SortingColumn.Text.Substring(2)
        End If
        ' Display the new sort order.
        m_SortingColumn = new_sorting_column
        If sort_order = SortOrder.Ascending Then
            m_SortingColumn.Text = "> " & m_SortingColumn.Text
        Else
            m_SortingColumn.Text = "< " & m_SortingColumn.Text
        End If
        ' Create a comparer.
        ListView1.ListViewItemSorter = New clsListviewSorter(e.Column, sort_order)
        ' Sort.
        ListView1.Sort()
    End Sub