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Posted 23 May 2010

BackgroundWorker and ProgressBar demo

, 23 May 2010
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A simple demonstration of how to use a BackgroundWorker with a ProgressBar
This gets asked almost daily so I've written this short demonstration code to demonstrate how to use a System.ComponentModel.BackgroundWorker in combination with a System.Windows.Forms.ProgressBar. All the code is commented so the flow/steps should be easy to understand.

Just drop a ProgressBar (progressBar1) and a BackgroundWorker (backgroundWorker1) onto your form and copy and paste this code to see it in action.
public partial class Form1 : Form
    public Form1()
        Shown += new EventHandler(Form1_Shown);

        // To report progress from the background worker we need to set this property
        backgroundWorker1.WorkerReportsProgress = true;
        // This event will be raised on the worker thread when the worker starts
        backgroundWorker1.DoWork += new DoWorkEventHandler(backgroundWorker1_DoWork);
        // This event will be raised when we call ReportProgress
        backgroundWorker1.ProgressChanged += new ProgressChangedEventHandler(backgroundWorker1_ProgressChanged);
    void Form1_Shown(object sender, EventArgs e)
        // Start the background worker
    // On worker thread so do our thing!
    void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        // Your background task goes here
        for (int i = 0; i <= 100; i++)
            // Report progress to 'UI' thread
            // Simulate long task
    // Back on the 'UI' thread so we can update the progress bar
    void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        // The progress percentage is a property of e
        progressBar1.Value = e.ProgressPercentage;


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

CEO Dave Meadowcroft
United Kingdom United Kingdom
No Biography provided

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QuestionIf you want to run your long time taking task 100 times... Pin
PJH Smit4-Jan-16 23:41
memberPJH Smit4-Jan-16 23:41 
QuestionInvalidOperationException Pin
Member 1172314127-May-15 6:11
memberMember 1172314127-May-15 6:11 
AnswerRe: InvalidOperationException Pin
DaveyM6929-May-15 1:51
mentorDaveyM6929-May-15 1:51 
AnswerRe: InvalidOperationException Pin
Aizaz Hussain6-Dec-17 6:46
memberAizaz Hussain6-Dec-17 6:46 
QuestionGetting exception System.InvalidOperationException Pin
Govind K24-Aug-14 22:20
professionalGovind K24-Aug-14 22:20 
AnswerRe: Getting exception System.InvalidOperationException Pin
DaveyM6914-Oct-14 4:38
mentorDaveyM6914-Oct-14 4:38 
AnswerRe: Getting exception System.InvalidOperationException Pin
DaveyM6929-May-15 1:54
mentorDaveyM6929-May-15 1:54 
QuestionIs there any reason...? Pin
James McCullough10-Nov-13 16:48
memberJames McCullough10-Nov-13 16:48 
AnswerRe: Is there any reason...? Pin
DaveyM6911-Nov-13 2:44
mentorDaveyM6911-Nov-13 2:44 
GeneralRe: Is there any reason...? Pin
James McCullough11-Nov-13 9:41
memberJames McCullough11-Nov-13 9:41 
QuestionBackgroundWorker and ProgressBar Pin
rainer_martin25-Jul-13 19:17
memberrainer_martin25-Jul-13 19:17 
GeneralMy vote of 5 Pin
rainer_martin25-Jul-13 19:16
memberrainer_martin25-Jul-13 19:16 
QuestionVB.Net Code for BackgroundWorker and ProgressBar Demo Pin
Member 886365516-May-13 11:34
memberMember 886365516-May-13 11:34 
AnswerRe: VB.Net Code for BackgroundWorker and ProgressBar Demo Pin
DaveyM6920-May-13 3:45
mentorDaveyM6920-May-13 3:45 
GeneralRe: VB.Net Code for BackgroundWorker and ProgressBar Demo Pin
Member 886365520-May-13 18:59
memberMember 886365520-May-13 18:59 
GeneralMy vote of 5 Pin
aGISer24-Apr-13 23:00
memberaGISer24-Apr-13 23:00 
QuestionI am new to Background Worker and Progress Bar Here Pin
prashantn.pol2-Jan-13 0:00
memberprashantn.pol2-Jan-13 0:00 
GeneralMy vote of 5 Pin
tausif_91-Aug-12 4:57
membertausif_91-Aug-12 4:57 
GeneralMy vote of 4 Pin
sirama200431-Jul-12 0:01
membersirama200431-Jul-12 0:01 
GeneralMy vote of 4 Pin
prasad kolekar6015-Jun-12 2:26
memberprasad kolekar6015-Jun-12 2:26 
GeneralReason for my vote of 5 Simple and to the point. Pin
ProEnggSoft24-Feb-12 5:18
memberProEnggSoft24-Feb-12 5:18 
GeneralReason for my vote of 5 Simple, straightforward, well commen... Pin
5cw12-Feb-12 12:51
member5cw12-Feb-12 12:51 
GeneralThanks a whole lot, I'm a newbe, and after searching thru 30... Pin
Inflicter15-Sep-11 9:48
memberInflicter15-Sep-11 9:48 
GeneralReason for my vote of 5 Simple to the point In Title Pin
Airelement07414-Jun-11 8:17
memberAirelement07414-Jun-11 8:17 
GeneralReason for my vote of 4 practical Pin
phiyano2-Aug-10 18:13
memberphiyano2-Aug-10 18:13 

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