how to sort time in listbox

[ms0080101]

Is everyone know how to sort time in listbox I've done the code for time to show on the listbox
every time the user enter the laptime is different
I need to sort time like
2:45
5:30
10:20

Here is my code Thanks a lot

Partial Class laptime
Inherits System.Web.UI.Page
Private lap() As String
Protected Sub butaddtime_Click(sender As Object, e As System.EventArgs) Handles butaddtime.Click


If Session("myarray") IsNot Nothing Then
lap = Session("myarray")
Dim arrlength As Integer = lap.GetUpperBound(0)
ReDim Preserve lap(arrlength + 1)
lap(arrlength + 1) = txtlaptime.Text
Else
ReDim lap(0)
lap(0) = txtlaptime.Text
End If
Session("myarray") = lap
laplist.Items.Clear()
Dim strtime As String
For Each strtime In lap
Dim newtime As ListItem = New ListItem
newtime.Text = strtime
laplist.Items.Add(newtime)
Next

End Sub
End Class