Private Sub Quick_Sort(ByRef SortArray As Variant, ByVal First As Long, ByVal Last As Long)
Dim Low As Long, High As Long
Dim Temp As Variant, List_Separator As Variant
Low = First
High = Last
List_Separator = SortArray((First + Last) / 2)
Do
    Do While (SortArray(Low) < List_Separator)
        Low = Low + 1
    Loop
    Do While (SortArray(High) > List_Separator)
        High = High - 1
    Loop
    If (Low <= High) Then
        Temp = SortArray(Low)
        SortArray(Low) = SortArray(High)
        SortArray(High) = Temp
        Low = Low + 1
        High = High - 1
    End If
Loop While (Low <= High)
If (First < High) Then Quick_Sort SortArray, First, High
If (Low < Last) Then Quick_Sort SortArray, Low, Last
End Sub