How to Use Winforms Progress Bar

How to use WinForms progress bar?

I would suggest you have a look at BackgroundWorker. If you have a loop that large in your WinForm it will block and your app will look like it has hanged.

Look at BackgroundWorker.ReportProgress() to see how to report progress back to the UI thread.

For example:

private void Calculate(int i)
{
    double pow = Math.Pow(i, i);
}

private void button1_Click(object sender, EventArgs e)
{
    progressBar1.Maximum = 100;
    progressBar1.Step = 1;
    progressBar1.Value = 0;
    backgroundWorker.RunWorkerAsync();
}

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
    var backgroundWorker = sender as BackgroundWorker;
    for (int j = 0; j < 100000; j++)
    {
        Calculate(j);
        backgroundWorker.ReportProgress((j * 100) / 100000);
    }
}

private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}

private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    // TODO: do something with final calculation.
}

How do I get WinForms Progress Bar to update while not visible, and then show at the updated value?

Thanks to those who responded. I tried both suggested and the comment by @Jimi worked, so the final solution was to update the SetProgress method as follows:

    public void SetPogress(int progress)
    {
        if (!progressBar1.IsHandleCreated) { var h = progressBar1.Handle; }
        progressBar1.Value = progress;
    }

fix progress bar in WinForms

Actually, Your code run very vast, it is about less than a second to set value from 0% to 100% ! But
ProgressBar has two styles for displaying the current status (Classic and Continues).

In Continues mode if the progress value went to 100% from 0% the control will show an animation, which is not display the real and accurate progress. You can set a delay via Thread.Sleep() and show your label immediately after the for loop to find out to what i happening !

The Below code will work:

private void button1_Click(object sender, EventArgs e)
{
    int i = 0;
    progressBar1.Minimum = 0;
    progressBar1.Maximum = 5000;
    for (i = 0; i <= 5000; i++)
    {
        Thread.Sleep(1);
        progressBar1.Value = i;

    }
    label1.Visible = true;
}

How to run a progress bar for entire duration of a button (C# Windows Form)

Mark your button1 Click() handler with async, then use await and Task.Run:

    private async void button1_Click(object sender, EventArgs e)
    {
        // START PROGRESS BAR MOVEMENT:
        button1.Enabled = false;
        pb.Style = ProgressBarStyle.Marquee;
        pb.Show();

        // DO THE WORK ON A DIFFERENT THREAD:
        await (Task.Run(() =>
        {
            System.Threading.Thread.Sleep(5000); // simulated work (remove this and uncomment the two lines below)
            //LoadDatabase.Groups();
            //ProcessResults.GroupOne();
        }));

        // END PROGRESS BAR MOVEMENT:
        pb.Hide();
        button1.Enabled = true;
    }

Implementing Progress Bar Winform

You can set the progress bars maximum value to the number of emails, for each email you send, increment the progress bar.

Something like this perhaps?

        private int emailLength;
        private ProgressBar ProgressBar1 = new ProgressBar();

         public void Main()
         {
            emailLength = 16;
            progressBar1.Maximum = emailLength;
            sendEmails();
         }
         public void sendEmails()
         {
             for (int i = 0; i <= emailLength; i++)
             {
                //Send Emails Here
                progressBar1.Increment();
             }
         }

How to implement a progress bar in windows forms C#?

Your program has many loops,since it will be difficult to get the increment value and increment the progress bar value in each loop iteration.You could set the progress bar maximum to 100,Then divide 100 by the number of loops you have say X.

So the trick would be to fill the progress bar by this value when each loops completes

and yes you should put this code in backgroundworker's DoWork() otherwise it will freeze the form.Also there is no need for a timer.

C# winforms progress bar

When I have had to do such things in the past I usually use a BackgroundWorker and use its ReportProgress() method which fires the ProgressChanged event on the UI thread.

I think this is a good way to go about doing things if you know how many tests you are going to preform and can call UpdateProgress after each test is complete.

Here is a link to a nice easy to follow example.

Dot NET Perls - ProgressBar w/ BackgroundWorker

C# Winforms - ProgressBar does not display and reset properly

OK, so here is my attempt at answering your question:

I don't think that the progress bar does not 'update' when you reset its value to 1 after the loop. I think that the whole animation of the progress bar is quite a fake.

I took a look at the source code for ProgressBar here. We note that both ProgressBar.Value and ProgressBar.PerformStep utimately call into UpdatePos that in turn sends a PBM_SETPOS message to the underlying native control. Then MSDN tells us that the bar should redraw each time it receives this message.

However, I suspect the 'real' animation of the bar is somewhat virtualized by the control. My guess is that the PBM_SETPOS messages are immediately taken into account with respect to the position value (we wouldn't want our bar not to know its value at every time), but they must also be sent to some queue for the animation.

The animation can take quite a long time and it would be canceled if something happens that requires the animation to stop or to be modified, going backwards for instance...
Suppose you alternate values 1 and 51 instead of incrementing the current value, what sort of animation do you expect?

I simulated this by replacing pBar.PerformStep(); in your code by:

pBar.Value = j % 2 * 50 + 1;

and, of course not having the trailing pBar.Value = 1;.

The resulting animation is not a sickening round-trip between 1 and 51 but a clean and smooth transition from 1 to 51 :)

I think this proves my point that the animation is picking what values it wants on its own, so that when quickly setting 1 just after 100, the animation engine decides not to render anything.

So if you want to avoid this effect, the simplest thing to do is to reset the bar value to 1 before you use it instead of just after (and btw, it may prove better programming practice not to assume the progress bar value is 1 when you use it).

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PS: as a final note, the same phenomenon was used as a trick to force a high value on a progress bar before the animation has time to complete here.

In your case, you could have:

private void GoSlowlyTo100() => pBar.Value = 100;
private void GoQuicklyTo100()
{
    pBar.Maximum = 101;
    pBar.Value = 101;
    pBar.Maximum = 100;
    pBar.Value = 100;
}

Hope this answers your question!

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