diff --git a/PacticeSolution/ObervableCollectionSample/App.xaml b/PacticeSolution/ObervableCollectionSample/App.xaml
new file mode 100644
index 0000000..e53ad33
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/App.xaml
@@ -0,0 +1,9 @@
+<Application x:Class="ObervableCollectionSample.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:ObervableCollectionSample"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>
diff --git a/PacticeSolution/ObervableCollectionSample/App.xaml.cs b/PacticeSolution/ObervableCollectionSample/App.xaml.cs
new file mode 100644
index 0000000..4a01fe8
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/App.xaml.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace ObervableCollectionSample
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}
diff --git a/PacticeSolution/ObervableCollectionSample/AssemblyInfo.cs b/PacticeSolution/ObervableCollectionSample/AssemblyInfo.cs
new file mode 100644
index 0000000..8b5504e
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/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/ObervableCollectionSample/MainWindow.xaml b/PacticeSolution/ObervableCollectionSample/MainWindow.xaml
new file mode 100644
index 0000000..fd47cfa
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/MainWindow.xaml
@@ -0,0 +1,25 @@
+<Window x:Class="ObervableCollectionSample.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:ObervableCollectionSample"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Window.DataContext>
+        <local:PersonCollection/>
+    </Window.DataContext>
+    
+    <StackPanel>
+        <ListView ItemsSource="{Binding}">
+            <ListView.ItemTemplate>
+                <DataTemplate>
+                    <StackPanel>
+                        <TextBlock Text="{Binding Name}"/>
+                    </StackPanel>
+                </DataTemplate>
+            </ListView.ItemTemplate>
+        </ListView>
+        <Button Content="Add" Click="Button_Click"/>
+    </StackPanel>
+</Window>
diff --git a/PacticeSolution/ObervableCollectionSample/MainWindow.xaml.cs b/PacticeSolution/ObervableCollectionSample/MainWindow.xaml.cs
new file mode 100644
index 0000000..01ed250
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/MainWindow.xaml.cs
@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+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 ObervableCollectionSample
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private void Button_Click(object sender, RoutedEventArgs e)
+        {
+            ObservableCollection<Person> context = this.DataContext as ObservableCollection<Person>;
+            if (context == null)
+                return;
+
+            context.Add(new Person("New person"));
+        }
+    }
+}
diff --git a/PacticeSolution/ObervableCollectionSample/ObervableCollectionSample.csproj b/PacticeSolution/ObervableCollectionSample/ObervableCollectionSample.csproj
new file mode 100644
index 0000000..4106cb0
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/ObervableCollectionSample.csproj
@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+</Project>
diff --git a/PacticeSolution/ObervableCollectionSample/Person.cs b/PacticeSolution/ObervableCollectionSample/Person.cs
new file mode 100644
index 0000000..ae80fa4
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/Person.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ObervableCollectionSample
+{
+    public class Person
+    {
+        public string Name { get; set; }
+
+        public Person(string name)
+        {
+            this.Name = name;
+        }
+    }
+}
diff --git a/PacticeSolution/ObervableCollectionSample/PersonCollection.cs b/PacticeSolution/ObervableCollectionSample/PersonCollection.cs
new file mode 100644
index 0000000..86948a4
--- /dev/null
+++ b/PacticeSolution/ObervableCollectionSample/PersonCollection.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ObervableCollectionSample
+{
+    public class PersonCollection : ObservableCollection<Person>
+    {
+        public PersonCollection()
+        {
+            InitInstance();
+        }
+
+        private void InitInstance()
+        {
+            this.Add(new Person("neymar"));
+            this.Add(new Person("messi"));
+            this.Add(new Person("ronaldo"));
+            this.Add(new Person("park"));
+            this.Add(new Person("sonny"));
+        }
+    }
+}
diff --git a/PacticeSolution/PacticeSolution.sln b/PacticeSolution/PacticeSolution.sln
index 96f9496..8af917d 100644
--- a/PacticeSolution/PacticeSolution.sln
+++ b/PacticeSolution/PacticeSolution.sln
@@ -107,13 +107,15 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "StaticResourceSample", "Sta
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "HowToUseStyle", "HowToUseStyle\HowToUseStyle.csproj", "{6E182894-D2F1-4D2C-B991-51B01A2E3223}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ListViewEditSample", "ListViewEditSample\ListViewEditSample.csproj", "{87E66D9A-4E6C-43E8-B23A-AB2A2E9F67D5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ListViewEditSample", "ListViewEditSample\ListViewEditSample.csproj", "{87E66D9A-4E6C-43E8-B23A-AB2A2E9F67D5}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DelegateEventFuncAction", "DelegateEventFuncAction\DelegateEventFuncAction.csproj", "{52E7C139-F78C-4947-BB09-58D4BFF72435}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DelegateEventFuncAction", "DelegateEventFuncAction\DelegateEventFuncAction.csproj", "{52E7C139-F78C-4947-BB09-58D4BFF72435}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ClassInitInXaml", "ClassInitInXaml\ClassInitInXaml.csproj", "{4D5438AC-CDD0-4975-8D0A-F1BBF49F4EE5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ClassInitInXaml", "ClassInitInXaml\ClassInitInXaml.csproj", "{4D5438AC-CDD0-4975-8D0A-F1BBF49F4EE5}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ComboBoxSample", "ComboBoxSample\ComboBoxSample.csproj", "{0A10867D-797C-4477-A584-6CB72B1DE97A}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ComboBoxSample", "ComboBoxSample\ComboBoxSample.csproj", "{0A10867D-797C-4477-A584-6CB72B1DE97A}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ObervableCollectionSample", "ObervableCollectionSample\ObervableCollectionSample.csproj", "{0C2F6C56-5CAB-44BB-9890-7512C944CE1D}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -345,6 +347,10 @@ Global
 		{0A10867D-797C-4477-A584-6CB72B1DE97A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0A10867D-797C-4477-A584-6CB72B1DE97A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0A10867D-797C-4477-A584-6CB72B1DE97A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0C2F6C56-5CAB-44BB-9890-7512C944CE1D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0C2F6C56-5CAB-44BB-9890-7512C944CE1D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0C2F6C56-5CAB-44BB-9890-7512C944CE1D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0C2F6C56-5CAB-44BB-9890-7512C944CE1D}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE