Timer

I am using VB.Net delveloping Web base application (Online examination). I'd like to monitor the exam in terms of the lenght of time. For example, after 25 minutes the exam will shut down automitically.

I am thinking, after the form(WebForm1.aspx) loaded, there will be a timer shows on the top of the form. Starting form 00:00, and then when it reaches 25:00, the form will automatically unload. This is 1zjust my theory, but I have no idea how to do it. Does anybody know how to do this or even has better idea.

Thank you in advance.

This code is for a desktop application rather than a web one, but hopefully it will give you some useful ideas.

VB Code:

Public Class Form1
    Inherits System.Windows.Forms.Form
 
#Region " Windows Form Designer generated code "
 
    Private gStopTime As Date
    Private WithEvents tmr As New Timer()
    Private Const INTERVAL As Double = 25
 
    Private Sub Form1_Load(ByVal sender As System.Object, _
                           ByVal e As System.EventArgs) Handles MyBase.Load
 
        AddHandler Application.Idle, AddressOf UpdateClock
 
        With tmr
            .Interval = 1000
            .Start()
        End With
 
        gStopTime = Now.AddSeconds(INTERVAL)
 
    End Sub
 
    Private Sub UpdateClock(ByVal sender As Object, ByVal e As EventArgs)
 
        If Now >= gStopTime Then
            End
        Else
            lblTime.Text = DateDiff(DateInterval.Second, _
                                        gStopTime.AddSeconds(-INTERVAL), Now)
        End If
 
    End Sub
 
    Private Sub tmr_Tick(ByVal sender As Object, _
                         ByVal e As System.EventArgs) Handles tmr.Tick
 
        Application.DoEvents()
 
    End Sub
End Class

Thanks! I'll give it a try.