Added sample for Lecture 11.

Lectures/Lecture_11/Sample/CookBook.App/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <configSections>
+    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
+    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
+  </configSections>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
+  </startup>
+  <entityFramework>
+    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
+      <parameters>
+        <parameter value="mssqllocaldb" />
+      </parameters>
+    </defaultConnectionFactory>
+    <providers>
+      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
+    </providers>
+  </entityFramework>
+  <connectionStrings>
+    <add name="CookBookContext" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=CookBookDB;MultipleActiveResultSets=True;Integrated Security=True;" providerName="System.Data.SqlClient" />
+  </connectionStrings>
+</configuration>

Lectures/Lecture_11/Sample/CookBook.App/App.xaml

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+<Application x:Class="CookBook.App.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:converters="clr-namespace:CookBook.App.Converters"
+             xmlns:app="clr-namespace:CookBook.App"
+             StartupUri="Views/MainWindow.xaml">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.DeepPurple.xaml" />
+                <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Lime.xaml" />
+            </ResourceDictionary.MergedDictionaries>
+            <converters:NullToVisibilityConverter x:Key="NullToVisibilityConverter"/>
+            <converters:TimeSpanToMinutesConverter x:Key="TimeSpanToMinutesConverter"/>
+            <app:ViewModelLocator x:Key="ViewModelLocator" />
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

Lectures/Lecture_11/Sample/CookBook.App/App.xaml.cs

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+using System.Windows;
+
+namespace CookBook.App
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Lectures/Lecture_11/Sample/CookBook.App/Commands/RelayCommand.cs

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+using System;
+using System.Windows.Input;
+
+namespace CookBook.App.Commands
+{
+    public class RelayCommand : ICommand
+    {
+        private readonly Action<object> executeAction;
+        private readonly Func<object, bool> canExecuteAction;
+
+        public RelayCommand(Action<object> executeAction, Func<object, bool> canExecuteAction = null)
+        {
+            this.executeAction = executeAction;
+            this.canExecuteAction = canExecuteAction;
+        }
+
+        public RelayCommand(Action executeAction, Func<bool> canExecuteAction = null)
+            : this(p => executeAction(), p => canExecuteAction?.Invoke() ?? true)
+        {
+
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return canExecuteAction?.Invoke(parameter) ?? true;
+        }
+
+        public void Execute(object parameter)
+        {
+            executeAction?.Invoke(parameter);
+        }
+
+        public void RaiseCanExecuteChanged()
+        {
+            CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        public event EventHandler CanExecuteChanged;
+    }
+}

Lectures/Lecture_11/Sample/CookBook.App/Commands/SaveRecipeCommand.cs

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+using System;
+using System.Windows.Input;
+using CookBook.App.ViewModels;
+using CookBook.BL;
+using CookBook.BL.Messages;
+using CookBook.BL.Models;
+using CookBook.BL.Repositories;
+
+namespace CookBook.App.Commands
+{
+    public class SaveRecipeCommand : ICommand
+    {
+        private readonly RecipeRepository recipeRepository;
+        private readonly RecipeDetailViewModel viewModel;
+        private readonly IMessenger messenger;
+
+        public SaveRecipeCommand(RecipeRepository recipeRepository, RecipeDetailViewModel viewModel, IMessenger messenger)
+        {
+            this.recipeRepository = recipeRepository;
+            this.viewModel = viewModel;
+            this.messenger = messenger;
+        }
+
+        public bool CanExecute(object parameter)
+        {
+            return viewModel.Detail?.Duration.TotalMinutes > 0;
+        }
+
+        public void Execute(object parameter)
+        {
+            if (viewModel.Detail.Id == Guid.Empty)
+            {
+                viewModel.Detail = recipeRepository.Insert(viewModel.Detail);
+            }
+            else
+            {
+                recipeRepository.Update(viewModel.Detail);
+            }
+
+            messenger.Send(new UpdatedRecipeMessage(viewModel.Detail));
+        }
+
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+    }
+}

Lectures/Lecture_11/Sample/CookBook.App/Controls/CustomButton.xaml

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+<Button xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:CookBook.App.Controls"
+             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes" 
+             xmlns:Converters="clr-namespace:MaterialDesignThemes.Wpf.Converters;assembly=MaterialDesignThemes.Wpf" 
+             x:Class="CookBook.App.Controls.CustomButton"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800"
+             HorizontalAlignment="Left" 
+    VerticalAlignment="Top" Width="75" d:LayoutOverrides="Height, LeftPosition, RightPosition, TopPosition, BottomPosition" Style="{DynamicResource CustomButtonStyle}">
+    <Button.Resources>
+        <Style x:Key="CustomButtonStyle" TargetType="{x:Type Button}">
+            <Setter Property="FocusVisualStyle">
+                <Setter.Value>
+                    <Style>
+                        <Setter Property="Control.Template">
+                            <Setter.Value>
+                                <ControlTemplate>
+                                    <Rectangle Margin="2" SnapsToDevicePixels="True" Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" StrokeThickness="1" StrokeDashArray="1 2"/>
+                                </ControlTemplate>
+                            </Setter.Value>
+                        </Setter>
+                    </Style>
+                </Setter.Value>
+            </Setter>
+            <Setter Property="Background" Value="{DynamicResource PrimaryHueMidBrush}"/>
+            <Setter Property="BorderBrush" Value="{DynamicResource PrimaryHueMidBrush}"/>
+            <Setter Property="Foreground" Value="{DynamicResource PrimaryHueMidForegroundBrush}"/>
+            <Setter Property="materialDesign:RippleAssist.Feedback" Value="White"/>
+            <Setter Property="Cursor" Value="Hand"/>
+            <Setter Property="materialDesign:ShadowAssist.ShadowDepth" Value="Depth1"/>
+            <Setter Property="FontWeight" Value="Medium"/>
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="BorderThickness" Value="1"/>
+            <Setter Property="HorizontalContentAlignment" Value="Center"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
+            <Setter Property="Padding" Value="16,4"/>
+            <Setter Property="Height" Value="32"/>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="{x:Type Button}">
+                        <Grid x:Name="grid" Background="{x:Null}">
+                            <VisualStateManager.VisualStateGroups>
+                                <VisualStateGroup x:Name="CommonStates">
+                                    <VisualState x:Name="Normal"/>
+                                    <VisualState x:Name="MouseOver">
+                                        <Storyboard>
+                                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)" Storyboard.TargetName="border">
+                                                <EasingColorKeyFrame KeyTime="0:0:0.5" Value="#FF3A45B7"/>
+                                                <EasingColorKeyFrame KeyTime="0:0:1" Value="#FF3A8FB7"/>
+                                            </ColorAnimationUsingKeyFrames>
+                                        </Storyboard>
+                                    </VisualState>
+                                    <VisualState x:Name="Pressed"/>
+                                    <VisualState x:Name="Disabled"/>
+                                </VisualStateGroup>
+                            </VisualStateManager.VisualStateGroups>
+                            <AdornerDecorator CacheMode="{Binding (materialDesign:ShadowAssist.CacheMode), RelativeSource={RelativeSource Self}}">
+                                <Grid>
+                                    <Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2" Background="#FF673AB7">
+                                        <Border.Effect>
+                                            <Binding Path="(materialDesign:ShadowAssist.ShadowDepth)" RelativeSource="{RelativeSource TemplatedParent}">
+                                                <Binding.Converter>
+                                                    <Converters:ShadowConverter/>
+                                                </Binding.Converter>
+                                            </Binding>
+                                        </Border.Effect>
+                                    </Border>
+                                    <Border Background="{DynamicResource MaterialDesignBackground}" HorizontalAlignment="Left" Opacity="0.4">
+                                        <Border.Width>
+                                            <MultiBinding UpdateSourceTrigger="Default">
+                                                <MultiBinding.Converter>
+                                                    <Converters:RangeLengthConverter/>
+                                                </MultiBinding.Converter>
+                                                <Binding Path="(materialDesign:ButtonProgressAssist.Minimum)" RelativeSource="{RelativeSource TemplatedParent}"/>
+                                                <Binding Path="(materialDesign:ButtonProgressAssist.Maximum)" RelativeSource="{RelativeSource TemplatedParent}"/>
+                                                <Binding Path="(materialDesign:ButtonProgressAssist.Value)" RelativeSource="{RelativeSource TemplatedParent}"/>
+                                                <Binding Path="ActualWidth" RelativeSource="{RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type ButtonBase}}"/>
+                                            </MultiBinding>
+                                        </Border.Width>
+                                    </Border>
+                                </Grid>
+                            </AdornerDecorator>
+                            <materialDesign:Ripple ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Focusable="False" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                        </Grid>
+                        <ControlTemplate.Triggers>
+                            <Trigger Property="IsMouseOver" Value="True">
+                                <Setter Property="materialDesign:ShadowAssist.Darken" TargetName="border" Value="True"/>
+                            </Trigger>
+                            <Trigger Property="IsKeyboardFocused" Value="True">
+                                <Setter Property="materialDesign:ShadowAssist.Darken" TargetName="border" Value="True"/>
+                            </Trigger>
+                            <Trigger Property="IsEnabled" Value="False">
+                                <Setter Property="Opacity" Value="0.23"/>
+                            </Trigger>
+                        </ControlTemplate.Triggers>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+    </Button.Resources>
+</Button>

Lectures/Lecture_11/Sample/CookBook.App/Controls/CustomButton.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace CookBook.App.Controls
+{
+    /// <summary>
+    /// Interaction logic for CustomButton.xaml
+    /// </summary>
+    public partial class CustomButton
+    {
+        public CustomButton()
+        {
+            InitializeComponent();
+        }
+    }
+}

Lectures/Lecture_11/Sample/CookBook.App/Converters/NullToVisibilityConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace CookBook.App.Converters
+{
+    public class NullToVisibilityConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return value == null ? Visibility.Collapsed : Visibility.Visible;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}

Lectures/Lecture_11/Sample/CookBook.App/Converters/TimeSpanToMinutesConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace CookBook.App.Converters
+{
+    public class TimeSpanToMinutesConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var time = value as TimeSpan?;
+
+            return time?.TotalMinutes;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var minutes = value?.ToString();
+
+            if (minutes != null)
+            {
+                if (int.TryParse(minutes, out var minutesCount))
+                {
+                    return TimeSpan.FromMinutes(minutesCount);
+                }
+            }
+
+            return null;
+        }
+    }
+}