Conversion of time to seconds - vb.net

Question

I have this conversion issue.
I have a stopwatch which counts down. Then displays it on a label so it shows like this "15:00:00" on a label(label1) counting down.
I have another time which loop every 10 seconds to lap the stopwatch and save the lapped time to another label(label2)
So how did I get 15:00:00?
I have 3 textboxes in my form, 1st is for hours, 2nd for minutes and third for sec.
If I input 15 on hours, and 00 on minutes and seconds and hit button1, it automatically converts 15hours(15:00:00) to seconds which is saved in my database so instead of saving 15:00:00 it saves the TotalSeconds which is 54000 Seconds.
When my stopwatch starts, it gets the 54000 from database and again converts it to 15:00:00 that is displayed in label1.
Can I convert lapped time on label2("13:00:00") to seconds which will display the converted value yet to another label(which is now label3).?
Imports System
Imports System.Timers
Public Class ClientDashboard
Dim StopWatch As New Stopwatch
Dim CountDown As TimeSpan
Dim IsRunning As Boolean = False
Private Shared timer As System.Timers.Timer
Private Sub ClientDashboard_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'Sets dashboard to right
Me.Size = New System.Drawing.Size(317, 900)
Dim x As Integer
Dim y As Integer
x = Screen.PrimaryScreen.WorkingArea.Width - 317
y = Screen.PrimaryScreen.WorkingArea.Height - Screen.PrimaryScreen.WorkingArea.Height
Me.Location = New Point(x, y)
'get time of user
cn = New ADODB.Connection
Call conDB()
cn.Open()
Dim rs As New ADODB.Recordset
rs.Open("select * from tb_registration where=st_acc_number= '" & id_lbl.Text & "'", cn, 0, 3)
iduser_lbl.Text = "'" & rs("st_name").Value & "'""'" & rs("st_lname").Value & "'"
UserTotal.Text = rs("st_totaltimeleft").Value
'Start stopwatch
StopWatch.Start()
synchroUpdate.Enabled = True
synchroUpdate.Start()
Dim numSecs As Integer
Integer.TryParse(UserTotal.Text, numSecs)
CountDown = TimeSpan.FromSeconds(numSecs)
End Sub
Private Sub synchro_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles synchro.Tick
End Sub
'--------------------->>>> Methord 2 <<<<----------------------
Private Sub DispElaps(ByVal ts As TimeSpan, ByVal lbl As Label)
lbl.Text = String.Format("{0:00} : {1:00} : {2:00}", _
Math.Floor(ts.TotalHours), _
ts.Minutes, _
ts.Seconds, _
ts.Milliseconds)
End Sub
Private Sub synchroUpdate_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles synchroUpdate.Tick
synchroUpdate.Interval = 100
'If countDown > stpw.Elapsed Then
Dim elaps As TimeSpan = CountDown - StopWatch.Elapsed
DispElaps(elaps, TimerOutput)
'Else
'End If
End Sub
Private Sub DoEvent()
timer = New System.Timers.Timer(5000)
AddHandler timer.Elapsed, AddressOf AC
timer.AutoReset = True
timer.Enabled = True
End Sub
'Address of event
Private Sub SaveEvent2(ByVal sender As System.Object, ByVal e As EventArgs)
AutoUpdate_Button.PerformClick()
End Sub
'Event Handler
Private Sub AC()
If Me.InvokeRequired Then
Me.Invoke(New MethodInvoker(AddressOf AC))
Else
Me.AutoUpdate_Button.PerformClick()
End If
End Sub
Private Sub logoutBTN_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles logoutBTN.Click
End Sub
End Sub
End Class

Answer 1

Your code seems to use good names for labels, but your question has not been updated to correspond.
Nevertheless, can you just use TimeSpan.TotalSeconds similar to where where you're already using TimeSpan.TotalHours?