How Do I Convert Timespan To Integer?

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VB

Hi, Im writing a simple parking lot project. What I need to do is to input a arrival time and a departing time, then the application should make calculations based on how munch time the car stayed on the parking lot.

My problem is that I don't know how to covert that timespan value to a integer value in order to make those operations. This what I done so far...



Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim final As String = TextBox4.Text
Dim inicial As String = TextBox3.Text
Dim tiempoI As TimeSpan = TimeSpan.Parse(inicial)
Dim tiempoF As TimeSpan = TimeSpan.Parse(final)
Dim resta As TimeSpan = tiempoF - tiempoI
TextBox5.Text = resta.ToString

End Sub
End Class

ANY HELP PLEASE?