Use ProgressBar in Windows Forms with a background thread to indicate progress.
ProgressBar. This indicates the progress of an operation. ProgressBar is best used on a long-running computation or task. And BackgroundWorker is often used to perform that task—it does not block the interface.
Example. Please add a ProgressBar control to your Windows Forms program by double-clicking on the ProgressBar entry in the Toolbox. For this example, we also need a BackgroundWorker—add one and then create the event handlers required.BackgroundWorker
Note: We need the Load event handler, the DoWork event handler, and the ProgressChanged event handler.
RunWorkerAsync: In Form1_Load, please add a method call to the RunWorkerAsync method on the BackgroundWorker instance. DoWork will begin.
DoWork: Here we loop over the numbers 1 through 100. We call the ReportProgress method on the BackgroundWorker instance.
Finally: In ProgressChanged, we set the value of the ProgressBar to the ProgressPercentage property of the ProgressChangedEventArgs argument.
Example that uses ProgressBar and BackgroundWorker: C#
public partial class Form1 : Form
private void Form1_Load(object sender, System.EventArgs e)
// Start the BackgroundWorker.
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
for (int i = 1; i <= 100; i++)
// Wait 100 milliseconds.
// Report progress.
private void backgroundWorker1_ProgressChanged(object sender,
// Change the value of the ProgressBar to the BackgroundWorker progress.
progressBar1.Value = e.ProgressPercentage;
// Set the text.
this.Text = e.ProgressPercentage.ToString();
Color. One of the useful properties on the ProgressBar is the ForeColor property. This can be set to a Color value to change the color of the bar itself that is drawn on the screen. It is often better to use the default color.
Note: In this screenshot, we see a yellow bar instead of the default blue bar. This is likely a bad design decision.
Summary. The ProgressBar control is often used in conjunction with a threading mechanism such as BackgroundWorker. With its many options, the ProgressBar makes a suitable widget for letting your users know the application is still active.