Show Progress Bar while Accessing data from Server

Question

Hi,
I need a Progress bar to be displayed when my application triggers database to backup, As the data would be large progress bar makes sense to display the time span.
I need a progress bar in place to show the progress of the task,
Can anyone suggest me how to do this? This should be shown when i backup my database from WPF.
I have code written for server side and just need a progress bar and timer.
Thanks,
Shreyas M

Answer 1

You could use a BackgroundWorker. There is a complete code sample available on MSDN here:
https://msdn.microsoft.com/en-us/library/cc221403(v=vs.95).aspx. You do the long-running work, i.e. the actual backup, in the DoWork event handler.
Note that you will need to report the progress (by calling the ReportProgress method of the BackgroundWorker) and calculate the total time it will take to complete the backup operation yourself.
It might be easier to just display some "waiting" element and no progress bar during the time it takes for the operation to complete:
<!-- replace this with any element like for example an Image -->
<TextBlock x:Name="loadingElement" Visibility="Collapsed">please wait...</TextBlock>
loadingElement.Visibility = System.Windows.Visibility.Visible;
System.Threading.Tasks.Task.Factory.StartNew(() =>
//call your backup method here (this code is being run on a background thread....
.ContinueWith((t) =>
loadingElement.Visibility = System.Windows.Visibility.Collapsed;
}, System.Threading.CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.FromCurrentSynchronizationContext());
After all you probably don't know how long time it will take for the method to complete, right? If you want to display a ProgressBar, the backup method should report the progress somehow. If you just call a method and wait for it to complete, you have no
idea of how long time it will take for the method to return. You will then have to estimate the actual time and then increase the value of the progress bar accordingly.
There is no way to find out before hand exactly how long time it will take until a method returns so it is the responsibility of the (backup) method to report to the caller how long time it needs and how long time is left until it is done. Far from all API:s
support reporting progress.
As you see in the BackgroundWorker example on MSDN, you could call the ReportProgress once in each iteration of a loop but if there is no loop in your Backup method you better just display a busy indicator without a progress bar since you don't know anything
about the progress anyway.
Edit: You could of course also display a ProgressBar element with its IsIndeterminate set to True. Just replace the TextBlock and use the sample code above:
<ProgressBar x:Name="loadingElement" IsIndeterminate="True" Height="50"/>
Setting this property to true is useful when you don't know how long time the operation will take: 
https://msdn.microsoft.com/en-us/library/system.windows.controls.progressbar.isindeterminate(v=vs.110).aspx
Hope that helps.
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