how do i change label color according to timer control?

Question

1.00/5 (2 votes)

See more:

There are one label, two buttons (start timer, stop timer) and one timer control on my form. When I click on the start button the color of the label shall change according to the timer: 1^st second red color, 2^nd second blue, 3^rd second red, 4^th blue etc.. When I click on the stop button then the timer and thus the color change shall stop.

Please help me.

Posted 16-Feb-11 16:36pm

samir 2011

Updated 17-Feb-11 1:04am

Manfred Rudolf Bihy

v2

Add a Solution

Comments

Sergey Alexandrovich Kryukov 16-Feb-11 22:46pm

Any effort? This problem is too simple... Nobody would be interested to write this boring code for your.
--SA

2 solutions

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)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-02-16T17:01:00

The usual answer is using timer, but there using System.ComponentModel.BackgroundWorker is much easier and more robust.

By the way, don't use timer control (as a rule of a thumb, never), use System.Timers.Timer instead. Using the timer is simple, you won't need any extra instruction, just read its help. You need Control.Invoke to change your colors, see below.

Anyway, if you wanted to use timer control, its accuracy would not be better then that of thread.

This will give you idea how to work with BackgroundWorker: http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx[^], and this — how to stop (cancel) the background work: http://social.msdn.microsoft.com/Forums/en/csharpgeneral/thread/064fa2b3-8969-4060-970e-79785b854083[^].

Organize infinite loop in BackgroundWorker.DoWork, use System.Threading.Thread.Sleep(1000) between changes in color. Do color change via Control.Invoke. In the loop, the code should check BackgroundWorker.CancellationPending in order to support cancellation mechanism described in the reference above.

That's it.

—SA

Bhatt Aniruddh · Answer 2 · 2011-02-16T23:49:00

Solution 2

Code is:

VB

button_start_click()
{
    timer1.interval=timer1.interval+1000
    if timer1.interval=1000 then
        label1.backcolor=red
    elseif timer1.interval=2000 then
        label2.backcolor=green
    end if
}

button_stop()
{
    timer1.enable=false
    timer1.interval=0
}

[Edit: Added code tags.]

Posted 16-Feb-11 23:49pm

Bhatt Aniruddh

Updated 17-Feb-11 0:59am

v3

Comments

Manfred Rudolf Bihy 17-Feb-11 6:58am

Your code uses a timer to do absolutely timer unrelated stuff. What are you doing here?
If you really are going to use a timer you should at least have a handler for it. Switching the color in the start button's handler is not exactly what OP was asking for.
Please rethink you answer. I'll check back later and decide to vote then.

Sergey Alexandrovich Kryukov 17-Feb-11 20:03pm

I rather agree with Manfred, also see my note on Forms timer
Also, anonymous method at the point of invocation list update is much better.
--SA