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Wait fn/sleep/delay

Posted on 2005-03-15
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Last Modified: 2009-07-29
I need to create a delay of few seconds in my code.
Is there any efficient function to do that.
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Question by:rishaan
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5 Comments
 
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 13546995
Here are two different ways to create a delay.  The first makes the app delay in one line but then the app becomes unresponsive during that interval.  Hit the button and then try moving the form.  It will not respond until the interval is over.  Then second approach gives you a delay while keeping the app responsive.  Another alternative would be to use a Timer and boolean flag:

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

        System.Threading.Thread.Sleep(5000) ' five seconds

        Button1.Enabled = True
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Button2.Enabled = False

        Dim targetTime As DateTime = DateTime.Now().AddSeconds(5)
        Dim ts As TimeSpan
        Do
            Application.DoEvents() ' keep application responsive
            System.Threading.Thread.Sleep(50) ' very small delay to reduce CPU Usage
            ts = targetTime.Subtract(DateTime.Now)
        Loop While ts.TotalSeconds > 0

        Button2.Enabled = True
    End Sub
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Author Comment

by:rishaan
ID: 13547393
My application(service) is actually calling some other app and it has to wait till the other app takes on all the locks
So which one is good in my case??
Will thread.sleep etc cause any problem...I havent used threads...
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LVL 86

Expert Comment

by:Mike Tomlinson
ID: 13547411
>> it has to wait till the other app takes on all the locks

How do you know when this other app is done?  Do you need to wait for it to close?
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Author Comment

by:rishaan
ID: 13547885
no. I don't have to wait till it is done. But I have to give a delay to make sure the locks released by my app are taken by the other app.
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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 200 total points
ID: 13547975
With a service that has no user interface I would think the first method with only a call to System.Threading.Thread.Sleep() would be fine.

Of course, there is no guarantee that the locks will be taken by the end of your sleep interval...
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