diff --git a/PacticeSolution/AddressBook_MVVMSample/MainWindow.xaml.cs b/PacticeSolution/AddressBook_MVVMSample/MainWindow.xaml.cs
index 789facb..2ea5eee 100644
--- a/PacticeSolution/AddressBook_MVVMSample/MainWindow.xaml.cs
+++ b/PacticeSolution/AddressBook_MVVMSample/MainWindow.xaml.cs
@@ -104,8 +104,7 @@ namespace AddressBook_MVVMSample
             if (modify.ShowDialog() != true) 
                 return;
 
-            //this.Persons[this.SelectedIndex] = modifiedData;
-            selectedData = modifiedData;
+            this.Persons[this.SelectedIndex] = modifiedData;
         }
 
         private void CommandExitAction(object obj)
diff --git a/PacticeSolution/AddressBook_MVVMSample/SubWindow/AddViewWindow.xaml b/PacticeSolution/AddressBook_MVVMSample/SubWindow/AddViewWindow.xaml
index 6c58e37..9f27819 100644
--- a/PacticeSolution/AddressBook_MVVMSample/SubWindow/AddViewWindow.xaml
+++ b/PacticeSolution/AddressBook_MVVMSample/SubWindow/AddViewWindow.xaml
@@ -6,7 +6,7 @@
         xmlns:local="clr-namespace:AddressBook_MVVMSample.SubWindow"
         mc:Ignorable="d"
         d:DataContext="{d:DesignInstance local:AddViewWindow}"
-        Title="{Binding Caption, UpdateSourceTrigger=PropertyChanged}" Height="300" Width="300"
+        Title="{Binding Caption, UpdateSourceTrigger=PropertyChanged}" Height="300" Width="320"
         WindowStartupLocation="CenterOwner">
     <!--<Window.DataContext>
         <local:AddViewWindow/>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/AddressBook_MVVMSampleV2.csproj b/PacticeSolution/AddressBook_MVVMSampleV2/AddressBook_MVVMSampleV2.csproj
new file mode 100644
index 0000000..8ca16fc
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/AddressBook_MVVMSampleV2.csproj
@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="ReactiveUI.WPF" Version="19.4.1" />
+  </ItemGroup>
+
+</Project>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml b/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml
new file mode 100644
index 0000000..cee07e6
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml
@@ -0,0 +1,8 @@
+<Application x:Class="AddressBook_MVVMSampleV2.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:AddressBook_MVVMSampleV2">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml.cs b/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml.cs
new file mode 100644
index 0000000..5ed5eff
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/App.xaml.cs
@@ -0,0 +1,42 @@
+using AddressBook_MVVMSampleV2.Interface;
+using AddressBook_MVVMSampleV2.Model;
+using AddressBook_MVVMSampleV2.Service;
+using AddressBook_MVVMSampleV2.View;
+using AddressBook_MVVMSampleV2.ViewModel;
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace AddressBook_MVVMSampleV2
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+            
+            IMessageBoxService messageBoxService = new MessageBoxService();
+            MainViewModel mainViewModel = new MainViewModel(messageBoxService, CreateAddView);
+            MainView mainView = new MainView(mainViewModel);
+            mainView.Show();
+        }
+
+        private IDialogView CreateAddView(Person modifyData, AddViewModel.ViewType type = AddViewModel.ViewType.Add)
+        {
+            AddViewModel viewModel = new AddViewModel(modifyData, type);
+            return new AddView(viewModel);
+        }
+
+        protected override void OnExit(ExitEventArgs e)
+        {
+            base.OnExit(e);
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/AssemblyInfo.cs b/PacticeSolution/AddressBook_MVVMSampleV2/AssemblyInfo.cs
new file mode 100644
index 0000000..8b5504e
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/AssemblyInfo.cs
@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IDialogView.cs b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IDialogView.cs
new file mode 100644
index 0000000..6213437
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IDialogView.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AddressBook_MVVMSampleV2.Interface
+{
+    public interface IDialogView
+    {
+        bool? ShowDialog();
+        bool? DialogResult { get; set; }
+        void Show();
+        void Close();
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IMessageBoxService.cs b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IMessageBoxService.cs
new file mode 100644
index 0000000..b6132ef
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IMessageBoxService.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace AddressBook_MVVMSampleV2.Interface
+{
+    public interface IMessageBoxService
+    {
+        MessageBoxResult Show(string message);
+        MessageBoxResult Show(string message, string caption);
+        MessageBoxResult Show(string message, string caption, MessageBoxButton button, MessageBoxImage icon);
+
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IWindowView.cs b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IWindowView.cs
new file mode 100644
index 0000000..7de8f91
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/Interface/IWindowView.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace AddressBook_MVVMSampleV2.Interface
+{
+    internal interface IWindowView
+    {
+        void Show();
+        void Close();
+        Visibility Visibility { get; set; }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml b/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml
new file mode 100644
index 0000000..47d9d87
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml
@@ -0,0 +1,12 @@
+<Window x:Class="AddressBook_MVVMSampleV2.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:AddressBook_MVVMSampleV2"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+
+    </Grid>
+</Window>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml.cs b/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml.cs
new file mode 100644
index 0000000..e80a72a
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/MainWindow.xaml.cs
@@ -0,0 +1,28 @@
+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 AddressBook_MVVMSampleV2
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/Model/Person.cs b/PacticeSolution/AddressBook_MVVMSampleV2/Model/Person.cs
new file mode 100644
index 0000000..26b9693
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/Model/Person.cs
@@ -0,0 +1,53 @@
+using ReactiveUI;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AddressBook_MVVMSampleV2.Model
+{
+    public class Person : ReactiveObject
+    {
+        public Person()
+        {
+            
+        }
+
+        public Person(Person input)
+        {
+            _name = input.Name;
+            _gender = input.Gender;
+            _phoneNumber = input.PhoneNumber;
+            _address = input.Address;
+        }
+
+        private string _name;
+        public string Name
+        {
+            get { return _name; }
+            set { this.RaiseAndSetIfChanged(ref _name, value); }
+        }
+
+        private bool _gender;
+        public bool Gender
+        {
+            get { return _gender; }
+            set { this.RaiseAndSetIfChanged(ref _gender, value); }
+        }
+
+        private string _phoneNumber;
+        public string PhoneNumber
+        {
+            get { return _phoneNumber; }
+            set { this.RaiseAndSetIfChanged(ref _phoneNumber, value); }
+        }
+
+        private string _address;
+        public string Address
+        {
+            get { return _address; }
+            set { this.RaiseAndSetIfChanged(ref _address, value); }
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/Service/MessageBoxService.cs b/PacticeSolution/AddressBook_MVVMSampleV2/Service/MessageBoxService.cs
new file mode 100644
index 0000000..e3cbb15
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/Service/MessageBoxService.cs
@@ -0,0 +1,28 @@
+using AddressBook_MVVMSampleV2.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace AddressBook_MVVMSampleV2.Service
+{
+    internal class MessageBoxService : IMessageBoxService
+    {
+        public MessageBoxResult Show(string message)
+        {
+            return MessageBox.Show(message);
+        }
+
+        public MessageBoxResult Show(string message, string caption)
+        {
+            return MessageBox.Show(message, caption);
+        }
+
+        public MessageBoxResult Show(string message, string caption, MessageBoxButton button, MessageBoxImage icon)
+        {
+            return MessageBox.Show(message, caption, button, icon);
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml b/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml
new file mode 100644
index 0000000..a8af7ce
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml
@@ -0,0 +1,65 @@
+<Window x:Name="winAddView"
+        x:Class="AddressBook_MVVMSampleV2.View.AddView"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:AddressBook_MVVMSampleV2.View"
+        xmlns:vm="clr-namespace:AddressBook_MVVMSampleV2.ViewModel"
+        mc:Ignorable="d"
+        d:DataContext="{d:DesignInstance vm:AddViewModel}"
+        Title="{Binding Caption, UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}"
+        WindowStartupLocation="CenterScreen"
+        WindowStyle="ToolWindow"
+        Height="300" Width="300">
+    <Grid Margin="10">
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="60"/>
+            <ColumnDefinition Width="*"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="30"/>
+            <RowDefinition Height="30"/>
+            <RowDefinition Height="30"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="30"/>
+        </Grid.RowDefinitions>
+
+        <Label Grid.Column="0" Grid.Row="0" VerticalAlignment="Center" Margin="3"
+               Content="Name"/>
+        <TextBox Grid.Column="1" Grid.Row="0" Margin="3"
+                 TextWrapping="Wrap"
+                 Text="{Binding PersonData.Name, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
+
+        <Label Grid.Column="0" Grid.Row="1" VerticalAlignment="Center" Margin="3"
+               Content="Gender"/>
+        <TextBox Grid.Column="1" Grid.Row="1" Margin="3"
+                 TextWrapping="Wrap"
+                 Text="{Binding PersonData.Gender, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
+
+        <Label Grid.Column="0" Grid.Row="2" VerticalAlignment="Center" Margin="3"
+               Content="Phone"/>
+        <TextBox Grid.Column="1" Grid.Row="2" Margin="3"
+                 TextWrapping="Wrap"
+                 Text="{Binding PersonData.PhoneNumber, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
+
+        <Label Grid.Column="0" Grid.Row="3" VerticalAlignment="Center" Margin="3"
+               Content="Address"/>
+        <TextBox Grid.Column="1" Grid.Row="3" Margin="3"
+                 TextWrapping="Wrap"
+                 Text="{Binding PersonData.Address, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"/>
+
+        <StackPanel Grid.Column="1" Grid.Row="4" Orientation="Horizontal" HorizontalAlignment="Right" Margin="3">
+            <Button Width="70" Margin="3 0 0 0"
+                    Content="OK" 
+                    IsDefault="True"
+                    Command="{Binding OkCommand}"
+                    CommandParameter="{Binding ElementName=winAddView}"/>
+            <Button Width="70" Margin="3 0 0 0"
+                    Content="Cancel" 
+                    IsDefault="True"
+                    Command="{Binding CancelCommand}"
+                    CommandParameter="{Binding ElementName=winAddView}"/>
+        </StackPanel>
+    </Grid>
+</Window>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml.cs b/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml.cs
new file mode 100644
index 0000000..710ce93
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/View/AddView.xaml.cs
@@ -0,0 +1,31 @@
+using AddressBook_MVVMSampleV2.Interface;
+using AddressBook_MVVMSampleV2.ViewModel;
+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.Shapes;
+
+namespace AddressBook_MVVMSampleV2.View
+{
+    /// <summary>
+    /// AddView.xaml에 대한 상호 작용 논리
+    /// </summary>
+    public partial class AddView : Window, IDialogView
+    {
+        public AddView(AddViewModel addViewModel)
+        {
+            InitializeComponent();
+
+            this.DataContext = addViewModel;
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml b/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml
new file mode 100644
index 0000000..0296e0a
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml
@@ -0,0 +1,54 @@
+<Window x:Name="winMain" 
+        x:Class="AddressBook_MVVMSampleV2.View.MainView"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:AddressBook_MVVMSampleV2.View"
+        xmlns:vm="clr-namespace:AddressBook_MVVMSampleV2.ViewModel"
+        mc:Ignorable="d"
+        d:DataContext="{d:DesignInstance vm:MainViewModel}"
+        Title="Address Book" Height="350" Width="600"
+        WindowStartupLocation="CenterScreen">
+    <Grid Margin="10">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="40"/>
+        </Grid.RowDefinitions>
+
+        <DataGrid x:Name="grdPersons" Grid.Row="0"
+                  SelectionMode="Single" AutoGenerateColumns="False" IsReadOnly="True"
+                  AlternationCount="2" AlternatingRowBackground="LightSalmon"
+                  ItemsSource="{Binding Persons, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">
+            <DataGrid.InputBindings>
+                <MouseBinding Gesture="LeftDoubleClick"
+                              Command="{Binding ModifyCommand}"
+                              CommandParameter="{Binding ElementName=grdPersons, Path=SelectedIndex}"/>
+            </DataGrid.InputBindings>
+            <DataGrid.Columns>
+                <DataGridTextColumn Header="Name" Width="100"
+                                    Binding="{Binding Name}"/>
+                <DataGridTextColumn Header="Gender"
+                                    Binding="{Binding Gender}"/>
+                <DataGridTextColumn Header="Phone number" Width="100"
+                                    Binding="{Binding PhoneNumber}"/>
+                <DataGridTextColumn Header="Address" Width="200"
+                                    Binding="{Binding Address}"/>
+            </DataGrid.Columns>
+        </DataGrid>
+
+        <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right">
+            <Button Content="Add" Width="100" Margin="3"
+                    Command="{Binding AddCommand}"/>
+            <Button Content="Modify" Width="100" Margin="3"
+                    Command="{Binding ModifyCommand}"
+                    CommandParameter="{Binding ElementName=grdPersons, Path=SelectedIndex}"/>
+            <Button Content="Delete" Width="100" Margin="3"
+                    Command="{Binding DeleteCommand}"
+                    CommandParameter="{Binding ElementName=grdPersons, Path=SelectedIndex}"/>
+            <Button Content="Exit" Width="100" Margin="3"
+                    Command="{Binding ExitCommand}"
+                    CommandParameter="{Binding ElementName=winMain}"/>
+        </StackPanel>
+    </Grid>
+</Window>
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml.cs b/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml.cs
new file mode 100644
index 0000000..92db4a9
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/View/MainView.xaml.cs
@@ -0,0 +1,31 @@
+using AddressBook_MVVMSampleV2.Interface;
+using AddressBook_MVVMSampleV2.ViewModel;
+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.Shapes;
+
+namespace AddressBook_MVVMSampleV2.View
+{
+    /// <summary>
+    /// MainView.xaml에 대한 상호 작용 논리
+    /// </summary>
+    public partial class MainView : Window, IWindowView
+    {
+        public MainView(MainViewModel viewModel)
+        {
+            InitializeComponent();
+
+            this.DataContext = viewModel;
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/AddViewModel.cs b/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/AddViewModel.cs
new file mode 100644
index 0000000..cfd60ae
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/AddViewModel.cs
@@ -0,0 +1,67 @@
+using AddressBook_MVVMSampleV2.Interface;
+using AddressBook_MVVMSampleV2.Model;
+using ReactiveUI;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reactive;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace AddressBook_MVVMSampleV2.ViewModel
+{
+    public class AddViewModel : ReactiveObject
+    {
+        public enum ViewType
+        {
+            Add,
+            Modify
+        }
+
+        public Person PersonData { get; set; }
+
+        public ICommand OkCommand { get; private set; }
+        public ICommand CancelCommand { get; private set; }
+
+        public AddViewModel() : this(null, ViewType.Add)
+        {
+            
+        }
+
+        public AddViewModel(Person data = null, ViewType type = ViewType.Add)
+        {
+            if (type == ViewType.Modify)
+                this.Caption = "Modifty information";
+            else
+                this.Caption = "Add infomation";
+
+            this.PersonData = data;
+            this.OkCommand = ReactiveCommand.Create<IDialogView, Unit>(view => FuncOkCommand(view));
+            this.CancelCommand = ReactiveCommand.Create<IDialogView, Unit>(view => FuncCancelCommand(view));
+        }
+
+        private string _caption;
+        public string Caption
+        {
+            get { return _caption; }
+            set { this.RaiseAndSetIfChanged(ref _caption, value); }
+        }
+
+        private Unit FuncOkCommand(IDialogView view)
+        {
+            view.DialogResult = true;
+            view.Close();
+
+            return Unit.Default;
+        }
+
+        private Unit FuncCancelCommand(IDialogView view)
+        {
+            view.DialogResult = false;
+            view.Close();
+
+            return Unit.Default;
+        }
+    }
+}
diff --git a/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/MainViewModel.cs b/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/MainViewModel.cs
new file mode 100644
index 0000000..5052783
--- /dev/null
+++ b/PacticeSolution/AddressBook_MVVMSampleV2/ViewModel/MainViewModel.cs
@@ -0,0 +1,109 @@
+using AddressBook_MVVMSampleV2.Interface;
+using AddressBook_MVVMSampleV2.Model;
+using ReactiveUI;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Reactive;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Input;
+
+namespace AddressBook_MVVMSampleV2.ViewModel
+{
+    public class MainViewModel : ReactiveObject
+    {
+        public ObservableCollection<Person> Persons { get; set; }
+
+        public ICommand AddCommand { get; set; }
+        public ICommand DeleteCommand { get; set; }
+        public ICommand ModifyCommand { get; set; }
+        public ICommand ExitCommand { get; set; }
+
+        private readonly IMessageBoxService MessageBoxService;
+        private readonly Func<Person, AddViewModel.ViewType, IDialogView> CreateAddView;
+
+        public MainViewModel() : this(null, null)
+        {
+            
+        }
+
+        public MainViewModel(IMessageBoxService messageBoxService, Func<Person, AddViewModel.ViewType, IDialogView> createAddView)
+        {
+            this.MessageBoxService = messageBoxService;
+            this.CreateAddView = createAddView;
+
+            this.Persons = new ObservableCollection<Person>();
+
+            InitInstance();
+        }
+
+        private void InitInstance()
+        {
+            // Init Commands
+            this.AddCommand = ReactiveCommand.Create<Unit>(CommandAdd);
+            this.ModifyCommand = ReactiveCommand.Create<int, Unit>(index => CommandModify(index));
+            this.DeleteCommand = ReactiveCommand.Create<int, Unit>(index => CommandDelete(index));
+            this.ExitCommand = ReactiveCommand.Create<IWindowView, Unit>(view => CommandExit(view));
+
+            // Init Default Data
+            this.Persons.Add(new Person() { Name = "Kim", Gender = true, PhoneNumber = "123-4567", Address = "KOR" });
+            this.Persons.Add(new Person() { Name = "Max", Gender = true, PhoneNumber = "123-4567", Address = "USA" });
+            this.Persons.Add(new Person() { Name = "John", Gender = true, PhoneNumber = "123-4567", Address = "UK" });
+            this.Persons.Add(new Person() { Name = "Richard", Gender = true, PhoneNumber = "123-4567", Address = "UK" });
+            this.Persons.Add(new Person() { Name = "Shinoda", Gender = true, PhoneNumber = "123-4567", Address = "JPN" });
+        }
+
+        private Unit CommandAdd()
+        {
+            Person addData = new Person();
+            IDialogView view = this.CreateAddView(addData, AddViewModel.ViewType.Add);
+            if (view.ShowDialog() != true)
+                return Unit.Default;
+
+            this.Persons.Add(addData);
+            return Unit.Default;
+        }
+
+        private Unit CommandDelete(int selectedIndex)
+        {
+            if (selectedIndex < 0)
+            {
+                this.MessageBoxService.Show("No selected data.", "AddressBook", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Error);
+                return Unit.Default;
+            }
+
+            MessageBoxResult result = this.MessageBoxService.Show("Are you sure to delete?", "AddressBook", MessageBoxButton.OKCancel, MessageBoxImage.Question);
+            if (result != MessageBoxResult.OK)
+                return Unit.Default;
+
+            this.Persons.RemoveAt(selectedIndex);
+            return Unit.Default;
+        }
+
+        private Unit CommandModify(int selectedIndex)
+        {
+            if (selectedIndex < 0)
+            {
+                this.MessageBoxService.Show("No selected data.", "AddressBook", System.Windows.MessageBoxButton.OK, System.Windows.MessageBoxImage.Error);
+                return Unit.Default;
+            }
+
+            Person modifyData = new Person(this.Persons[selectedIndex]);
+            IDialogView view = this.CreateAddView(modifyData, AddViewModel.ViewType.Modify);
+            if (view.ShowDialog() != true)
+                return Unit.Default;
+
+            this.Persons[selectedIndex] = modifyData;
+            return Unit.Default;
+        }
+
+        private Unit CommandExit(IWindowView view)
+        {
+            view.Close();
+            return Unit.Default;
+        }
+    }
+}
diff --git a/PacticeSolution/PacticeSolution.sln b/PacticeSolution/PacticeSolution.sln
index 70af673..f3584b8 100644
--- a/PacticeSolution/PacticeSolution.sln
+++ b/PacticeSolution/PacticeSolution.sln
@@ -89,6 +89,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DashedFigure", "DashedFigur
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AddressBook_MVVMSample", "AddressBook_MVVMSample\AddressBook_MVVMSample.csproj", "{6A452509-3DEB-41A3-8AA3-8DB4BE948D28}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AddressBook_MVVMSampleV2", "AddressBook_MVVMSampleV2\AddressBook_MVVMSampleV2.csproj", "{0CE2A390-5A8B-4F13-9F60-A4AF77F0B1F3}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -267,6 +269,10 @@ Global
 		{6A452509-3DEB-41A3-8AA3-8DB4BE948D28}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6A452509-3DEB-41A3-8AA3-8DB4BE948D28}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6A452509-3DEB-41A3-8AA3-8DB4BE948D28}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0CE2A390-5A8B-4F13-9F60-A4AF77F0B1F3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0CE2A390-5A8B-4F13-9F60-A4AF77F0B1F3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0CE2A390-5A8B-4F13-9F60-A4AF77F0B1F3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0CE2A390-5A8B-4F13-9F60-A4AF77F0B1F3}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE