Breakpoints not working correctly ?

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C#

Windows-Store

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I am working on a Windows 8.1 UWP app.

I am facing differences when I had put breakpoints while debugging the app for Windows Phone 8.1 which I am debugging on my Windows Phone 10 device.

Below is code which I am calling from a page in windows phone using a button click :


Can someone please explain what is it that I am missing here.

What I have tried:

private void Button_Click(object sender, RoutedEventArgs e) // Have put the debugger for this method
{
    AuthenticateUser();
}

private async void AuthenticateUser()// On pressing F11, the debugger does not comes here which works when I try to debug the same code which I have it for my Windows 8.1 app
{
    App.service = await App.authHelper.AuthenticateAsync();
    if (App.service != null)
    {
        string folderID = DriveHelper.GetRootFolderId(App.service);
        if (App.service != null)
            this.Frame.Navigate(typeof(DriveHome), folderID);
    }
    else
    {
        // Show ERROR
    }
}

public class AuthenticationHelper
{
    private UserCredential credential;
    private DriveService service;

    public async Task<DriveService> AuthenticateAsync()
    {
        if (service != null)
            return service;
        try
        {
            credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
                new Uri("ms-appx:///Assets/client_secrets.json"),
                new[] { DriveService.Scope.Drive,
                        DriveService.Scope.DriveFile,
                        DriveService.Scope.DriveAppdata,
                        DriveService.Scope.DriveMetadata },
                "user",
                CancellationToken.None);

            var initializer = new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = "Google Drive Client",
            };

            service = new DriveService(initializer);
        }
        catch(Exception ex)
        {
        }
        return service;
    }
}