ProgressService progressService = GetService<ProgressService>();
progressService.ExecuteWithProgress("Opening File",
    "Task description",
    delegate
    {
        // Do some work 
        // ...

        ProgressService.CurrentProgress.ExecuteSubtask(
            "Sub task",
            stepCount,
            "Step {0} of {1}",
            delegate
            {
                try
                {
                    // Perform sub task 
                    for (int i = 0; i < stepCount; i++)
                    {
                        // Do something 
                        // ...

                        ProgressService.CurrentProgress.TryReportProgress();
                        ProgressService.CurrentProgress.CheckCancel();
                    }
                }
                catch (CanceledException)
                {
                    // Handle exception
                }
                finally
                {
                    // Perform Cleanup
                }
            });

        // Do more work 
        // ...
    }

ProgressService progressService = GetService<ProgressService>();
progressService.ExecuteWithProgress("Opening File",
    "Task description",
    delegate
    {
        // Do some work 
        // ...

        ProgressService.CurrentProgress.ExecuteSubtask(
            "Sub task",
            stepCount,
            "Step {0} of {1}",
            delegate
            {
                try
                {
                    // Perform sub task 
                    for (int i = 0; i < stepCount; i++)
                    {
                        // Do something 
                        // ...

                        ProgressService.CurrentProgress.TryReportProgress();
                        ProgressService.CurrentProgress.CheckCancel();
                    }
                }
                catch (CanceledException)
                {
                    // Handle exception
                }
                finally
                {
                    // Perform Cleanup
                }
            });

        // Do more work 
        // ...
    }