Countdown timer in reverse order

Question

0.00/5 (No votes)

See more:

Hi,

I've created a countdown timer whose code looks like:

C#

protected void Timer1_Tick(object sender, EventArgs e)
    {
        try
        {
            dt1 = dt1.AddSeconds(1);
Label4.Text = (TimeSpan.FromHours(2D) - TimeSpan.FromSeconds(dt1.Second)).ToString("hh\\:mm\\:ss");
}
}

But the above code worked for only 1 min. in reverse order then repetition goes on again. Can it be possible to create timer in reverse order for 1/2 hours.

Please provide the snippet

Thanks a lot in advance

What I have tried:

The above code I tried and the output comes like 01:59:59, 01:59:58 and so on.

Posted 11-Nov-16 6:14am

binadi007

Updated 11-Nov-16 6:29am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2016-11-11T06:29:00

Solution 1

Instead of using a DateTime and changing it, take the current time when you start teh timer, and set a target time:

C#

private DateTime target;
...
target = DateTime.Now.AddMinutes(30);
Timer1.Start();

Then, in your Tick handler, check the difference:

C#

void Timer1_Tick(object sender, EventArgs e)
    {
    TimeSpan diff = target - DateTime.Now;
    if (diff.TotalSeconds <= 0)
        {
        myTextBox.Text = "Done!";
        Timer1.Stop();
        }
    else
        {
        myTextBox.Text = ((int) diff.TotalSeconds).ToString();
        }
    }

That way, it will work with almost any offset, and be a lot more accurate.

Posted 11-Nov-16 6:29am

OriginalGriff

Comments

binadi007 11-Nov-16 13:29pm

Hi OriginallGriff,
I've some doubts,
1) Where to call "target = DateTime.Now.AddMinutes(30);" (I'm caling Timer1.Start() from aspx file i.e by <asp:timer> tag)
2) I need the remaining time in hh:mm:ss format not in seconds that is mentioned by myTextBox.Text = ((int) diff.TotalSeconds).ToString();

Thanks a lot for help

OriginalGriff 11-Nov-16 14:02pm

Right - don't do that in C# at all, don't even put the timer there.
For websites, you want the timer to be handled at the client, not the server: so do your countdown in Javascript, not C#.
Build a Countdown Timer in Just 18 Lines of JavaScript[^]

binadi007 11-Nov-16 21:56pm

yes you are right and I'll implement it as well, but for the time being can u provide the answer of these 2 questions i.e:-
1) Where to call "target = DateTime.Now.AddMinutes(30);" (I'm caling Timer1.Start() from aspx file i.e by <asp:timer> tag)
2) I need the remaining time in hh:mm:ss format not in seconds that is mentioned by myTextBox.Text = ((int) diff.TotalSeconds).ToString();

thanks

OriginalGriff 12-Nov-16 4:44am

No - because it's completely pointless as it's on the wrong side.