How to run progress bar continuously until DLL not correctly loaded.

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XAML

WPF

Hi ,
I am struggling With issue since three days.
I am using progress bar in Splash window. That Progress bar Run Correctly if i set await Task.Delay(1000) after one second my dll are going to load because Program wait for completing Delay time. After 1 sec my Progress bar stopped and my dll getting load.That make program lazy and its take much time to load application
i want both work simultaneously . My Progress bar Should run continuous and
My dll should run in back ground. After that it will open Login Window so please help me
Below is My Code
I created Progress bar in Xaml.

<ProgressBar Minimum="0" Maximum="100" Height="10" Background="Transparent" Width="100" Foreground="Black" Name="pbStatus" IsIndeterminate="True" Grid.Column="1" Margin="4,29,-4,20" />


My Splash Window Code In App.Xaml.cs

var splashScreen = new SplashWindow();
            //this.MainWindow = splashScreen;
            //this.MainWindow.Close();
            splashScreen.Show();
           // System.Threading.Thread th = new System.Threading.Thread();
            //in order to ensure the UI stays responsive, we need to
            //do the work on a different thread
            Task.Factory.StartNew(() =>
            {
                //simulate some work being done
                System.Threading.Thread.Sleep(5000);

                //since we're not on the UI thread
                //once we're done we need to use the Dispatcher
                //to create and show the main window
                this.Dispatcher.Invoke(() =>
                {
                    //initialize the main window, set it as the application main window
                    //and close the splash screen
                    var mainWindow = new Views.Common.LogIn();
                    this.MainWindow = mainWindow;
                        mainWindow.Show();
                    splashScreen.Close();
                });
            });

How can i over come with this issue

What I have tried:

this.Dispatcher.Invoke(() =>
                {
                    //initialize the main window, set it as the application main window
                    //and close the splash screen
                    var mainWindow = new Views.Common.LogIn();
                    this.MainWindow = mainWindow;
                        mainWindow.Show();
                    splashScreen.Close();
                });
            });

<pre>Task.Run(() =>
        {
             var mainWindow = new Views.Common.LogIn();
                    this.MainWindow = mainWindow;
                        mainWindow.Show();
                    splashScreen.Close();
        }