I'm a 4th year student and I want to finish my work. I'm having a problem after I updated the Visual Studio. I always get the error "Unknown MSBuild failure". I think it had a problem of its version, I tried to find the previous releases that are compatible but it seems I can't find the right one.

What Visual Studio compatible for MacBook Pro (13-inch, Mid 2010)? 

I am creating a xamarin form app which require user location after every 10 meter. I am able to get location when app is running in foreground but unable to get location when app get into background 

You can do it with device timer. The timer will run periodically & will check for location updates and notify if location updated. I have used Xam.Plugins.Notifier to generate local notification on location update.

public partial class MainPage : ContentPage
{
    Location oldLocation = null;
    CancellationTokenSource cts;
    public MainPage()
    {
        InitializeComponent();
        Device.StartTimer(TimeSpan.FromSeconds(10), () =>
        {
            GetCurrentLocation();
            return true;
        });
    }

    protected async override void OnAppearing()
    {
        base.OnAppearing();
        await GetCurrentLocation();
    }

    async Task GetCurrentLocation()
    {
        try
        {
            var request = new GeolocationRequest(GeolocationAccuracy.Medium, TimeSpan.FromSeconds(10));
            cts = new CancellationTokenSource();
            var location = await Geolocation.GetLocationAsync(request, cts.Token);

            if (location != null)
            {
                Debug.WriteLine($"Latitude: {location.Latitude}, Longitude: {location.Longitude}, Altitude: {location.Altitude}");
                if (oldLocation == null)
                {
                    oldLocation = location;
                    map.MoveToRegion(MapSpan.FromCenterAndRadius(
                   new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));
                }
                if (location.Latitude != oldLocation.Latitude || location.Longitude != oldLocation.Longitude)
                {
                    map.MoveToRegion(MapSpan.FromCenterAndRadius(
                   new Position(location.Latitude, location.Longitude), Distance.FromMiles(0.3)));

                    oldLocation = location;
                    double zoomLevel = 0.5;
                    double latlongDegrees = 360 / (Math.Pow(2, zoomLevel));
                    if (map.VisibleRegion != null)
                    {
                        map.MoveToRegion(new MapSpan(map.VisibleRegion.Center, latlongDegrees, latlongDegrees));
                    }

                    var placemarks = await Geocoding.GetPlacemarksAsync(location.Latitude, location.Longitude);
                    var placemark = placemarks?.FirstOrDefault();
                    if (placemark != null)


                    {
                        var geocodeAddress =
                            $"AdminArea:       {placemark.AdminArea}\n" +
                            $"CountryCode:     {placemark.CountryCode}\n" +
                            $"CountryName:     {placemark.CountryName}\n" +
                            $"FeatureName:     {placemark.FeatureName}\n" +
                            $"Locality:        {placemark.Locality}\n" +
                            $"PostalCode:      {placemark.PostalCode}\n" +
                            $"SubAdminArea:    {placemark.SubAdminArea}\n" +
                            $"SubLocality:     {placemark.SubLocality}\n" +
                            $"SubThoroughfare: {placemark.SubThoroughfare}\n" +
                            $"Location :       {placemark.Location}\n" +
                            $"Thoroughfare:    {placemark.Thoroughfare}\n";

                        Debug.WriteLine(geocodeAddress);
                    }
                    
                    CrossLocalNotifications.Current.Show("Location Updated", "You checked in to " + placemark.FeatureName + " " + placemark.Locality + " " + placemark.SubLocality, 101, DateTime.Now.AddSeconds(5));
                }
            }
        }
        catch (FeatureNotSupportedException)
        {
            // Handle not supported on device exception
        }
        catch (FeatureNotEnabledException)
        {
            // Handle not enabled on device exception
        }
        catch (PermissionException)
        {
            // Handle permission exception
        }
        catch (Exception)
        {
            // Unable to get location
        }
    }
}

Background Location Tracking for Android with Xamarin.Forms

I want to change placeholder position on focus in entry, place holder slide to up on top of the entry border with animation linear by using custom renderer, and can be avail to set margin and padding for placeholde 

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