The document discusses using a progress bar and background worker to indicate the progress of a long-running task. It provides an example C# program that uses a background worker's DoWork and ProgressChanged events to incrementally update a progress bar over time. The progress bar's ForeColor property can change its displayed color but the default is often best. Progress bars help reassure users that an application remains active during long operations.

1. Submitted by: MUHAMMAD USMAN
SALEEM (543)
Submitted to: ZAHID ASLAM & WHOLE CLASS
Progress-Bar

2. INTRODUCTION
Progress-Bar indicates visually the progress of
an operation. It is best used on a long-running
computation or task. And the Background-Worker
is often used to perform that task—it does not
block the interface.

3. Continue...
Example: Please add a Progress-Bar control to
your Windows-Forms program by double-clicking
on the Progress Bar entry in the Toolbox. For this
example, we also need a Background Worker—
add one and then create the event handlers
required.
Note : We need the Load event handler, the Do
Work event handler, and the Progress Changed
event handler.

4. Example that uses Progress Bar
and Background Worker: C#
using System.ComponentModel;
using System.Threading;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

5. Continue...
private void Form1_Load(object sender, System.EventArgs e)
{
// Start the BackgroundWorker.
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender,
DoWorkEventArgs e)
{
for (int i = 1; i <= 100; i++)
{
// Wait 100 milliseconds.
Thread.Sleep(100);
// Report progress. backgroundWorker1.
ReportProgress(i);
}

6. Continue…
private void backgroundWorker1_ProgressChanged(object
sender, ProgressChangedEventArgs e)
{
// Change the value of the ProgressBar to the
BackgroundWorker progress.
progressBar1.Value = e.ProgressPercentage;
// Set the text.
this.Text = e.ProgressPercentage.ToString();
}
}
}

7. Starting the background task
In the Form1_Load event handler, please add a
method call to the Run-Worker-Async method on
the Background-Worker instance. This will create
a thread and the Do-Work method will begin.

8. METHOD
Inside the Do-Work event handler, we loop
over the numbers 1 through 100. At each
iteration, we wait one-tenth of a second. Then, we
call the Report-Progress method on the
Background-Worker instance.
And:
In Progress-Changed, we set the value of the
Progress-Bar to the Progress-Percentage
property of the Progress-Changed-EventArgs
argument.

9. PROPERTY
Color
One of the useful properties on the Progress-Bar
is the Fore-Color 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.

10. Summary
The Progress-Bar control is often used in
conjunction with a threading mechanism such as
Background-Worker. With its many options, the
Progress-Bar makes a suitable widget for letting
your users know the application is still active.

11. THANKS