Пару неясностей по image в wpf

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
 
namespace Wpf_ImageExample
{
    public partial class MainWindow : Window
    {
        private int _index;
 
        public static readonly DependencyProperty MessageProperty = DependencyProperty.Register(
            "Message", typeof(string), typeof(MainWindow), new PropertyMetadata(default(string)));
 
        private DoubleAnimation _daHeight;
        private DoubleAnimation _daWidth;
 
        public MainWindow()
        {
            InitializeComponent();
 
            _daHeight = new DoubleAnimation(_border.Height, _border.Height + _border.Height / 4, new Duration(TimeSpan.FromMilliseconds(200)));
            _daHeight.AutoReverse = true;
            _daHeight.EasingFunction = new PowerEase() { Power = 0.4}; //new BackEase() { Amplitude = 6 };
 
            _daWidth = new DoubleAnimation(_border.Width, _border.Width + _border.Width / 4, new Duration(TimeSpan.FromMilliseconds(200)));
            _daWidth.AutoReverse = _daHeight.AutoReverse;
            _daWidth.EasingFunction = _daHeight.EasingFunction;
        }
 
        private void Border_MouseEnter(object sender, MouseEventArgs e)
        {
            if (_index + 1 == ContentProvider.Images.Length)
            {
                _index = 0;
            }
            else
            {
                _index++;
            }
 
            _image.Source = ContentProvider.Images[_index];
 
            Message = ContentProvider.Images[_index].UriSource.ToString();
        }
 
        public string Message
        {
            get { return (string)GetValue(MessageProperty); }
            set { SetValue(MessageProperty, value); }
        }
 
        private void Image_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            DoSomething(); //Какое-то действие
 
            _border.BeginAnimation(FrameworkElement.HeightProperty, _daHeight);
            _border.BeginAnimation(FrameworkElement.WidthProperty, _daWidth);
            
        }
 
        private void DoSomething()
        {
            switch (_index)
            {
                case 0: Background = Brushes.NavajoWhite;
                    break;
 
                case 1: Background = Brushes.LightSalmon;
                    break;
 
                case 2: Background = Brushes.BurlyWood;
                    break;
            }
        }
    }
}

 private void img_16_MouseEnter(object sender, MouseEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_2.png" , UriKind.Relative));
        }
        private void img_16_MouseLeave(object sender, MouseEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_1.png" , UriKind.Relative));
        }
        private void img_16_MouseDown(object sender, MouseButtonEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_3.png" , UriKind.Relative));
        }
        private void img_16_MouseUp(object sender, MouseButtonEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_2.png" , UriKind.Relative));
        }
        private void label6_MouseEnter(object sender, MouseEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_2.png" , UriKind.Relative));
        }
        private void label6_MouseLeave(object sender, MouseEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_1.png" , UriKind.Relative));
        }
        private void label6_MouseDown(object sender, MouseButtonEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_3.png" , UriKind.Relative));
        }
        private void label6_MouseUp(object sender, MouseButtonEventArgs e)
        {
                img_16.Source = new BitmapImage(new Uri("Resources/Resurs/TopRes1_2.png" , UriKind.Relative));
        }

static readonly string ResourcesUri = "/" + Assembly.GetExecutingAssembly().GetName().Name + ";component/Resources/";
Image1 = new BitmapImage(new Uri(UriPack + ResourcesUri + Pictures + "1.jpg", UriKind.Absolute));

Assembly.GetExecutingAssembly().GetName().Name