WPF Working with Progress Bar in VB.NET

Progress Bar is used to show the progress of a task in applications and it is important in order to let users known about the progress of work. For eg. when you copy a file from one drive to another, you can see the progress of copy operation.
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The given example demonstrates how to use Progress Bar and show progress in taskbar's icon in WPF.

Designing the user Interface in XAML

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
   
<!-- TaskbarItemInfo is an object and needed to interect with the task bar of windows 7 -->
   
<Window.TaskbarItemInfo >
       
<TaskbarItemInfo />
   
</Window.TaskbarItemInfo>
   
<Grid>
       
<!--Define a Progress Bar on Main Window-->
       
<ProgressBar Name="ProgressBar1" Margin="0" HorizontalAlignment="Center" VerticalAlignment="Center" Width="400" Height=" 30"/>
   
</Grid>
</
Window>

Code Behind

Imports System.ComponentModel
 Class
MainWindow
 
 
    Dim WithEvents BackgroundWorker1 As BackgroundWorker
 
 
    Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
         Me.BackgroundWorker1 = New BackgroundWorker
 
        'Enable progress reporting
 
        BackgroundWorker1.WorkerReportsProgress = True
 
        'Set the progress state as "normal"
 
        TaskbarItemInfo.ProgressState = Shell.TaskbarItemProgressState.Normal
         'Start the work
 
        BackgroundWorker1.RunWorkerAsync()
         'DoWork Event occurs
 
        'Now control will goes to worker_DoWork Sub because it handles the DoWork Event
 
    End Sub
 
 
     Private Sub worker_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
         For i As Integer = 0 To 99 Step 10
             System.Threading.Thread.Sleep(500)
             'Raises the ProgressChanged event passing the value
 
            CType(sender, System.ComponentModel.BackgroundWorker).ReportProgress(i)
             'Now control will goes to worker_ProgressChanged Sub because it handles the ProgressChanged Event
 
        Next i
     End Sub
 
 
    Private Sub worker_ProgressChanged(ByVal sender As Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
         'Increment the value on progress bars in window
 
        ProgressBar1.Value = e.ProgressPercentage
         'Increment the value on progress bars in Taskbar
 
        TaskbarItemInfo.ProgressValue = CDbl(e.ProgressPercentage) / 100
     End Sub
 
 
    ' Work completed
 
    Private Sub worker_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
         ProgressBar1.Value = 100
         TaskbarItemInfo.ProgressValue = 1.0
         'Set the progress state as "indeterminate"
 
        TaskbarItemInfo.ProgressState = Shell.TaskbarItemProgressState.Indeterminate
         'display a message box and keep the result in variable result
 
        Dim result = MessageBox.Show("The progress completed. Would you like to exit now?", "Message - Progress Completed", MessageBoxButton.YesNo)
         'if result is Yes - Close the application
 
        If result = MessageBoxResult.Yes Then End
 
    End Sub

 
 End
Class

Output :

When you will run the application, the following window will open and you will the progress in the progress bar.
 

progressbar1.gif
 

Also the progress can be seen in the task bar icon

progressbar2.gif
 

After the completion of the progress, you'll receive a message box as shown in below figure
 

progressbar3.gif

You can quit the application by pressing button - Yes.

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