How to Implement a Progress Bar in C#

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 implement a progress bar in C#?

Some people may not like it, but this is what I do:

private void StartBackgroundWork() {
    if (Application.RenderWithVisualStyles)
        progressBar.Style = ProgressBarStyle.Marquee;
    else {
        progressBar.Style = ProgressBarStyle.Continuous;
        progressBar.Maximum = 100;
        progressBar.Value = 0;
        timer.Enabled = true;
    }
    backgroundWorker.RunWorkerAsync();
}

private void timer_Tick(object sender, EventArgs e) {
    if (progressBar.Value < progressBar.Maximum)
        progressBar.Increment(5);
    else
        progressBar.Value = progressBar.Minimum;
}

The Marquee style requires VisualStyles to be enabled, but it continuously scrolls on its own without needing to be updated. I use that for database operations that don't report their progress.

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.

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 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;
}