diff --git a/src/WPFEduSolution/WPFBeginner/App.xaml.cs b/src/WPFEduSolution/WPFBeginner/App.xaml.cs
index 49d7ffc..3394a1d 100644
--- a/src/WPFEduSolution/WPFBeginner/App.xaml.cs
+++ b/src/WPFEduSolution/WPFBeginner/App.xaml.cs
@@ -1,10 +1,8 @@
-using System;
-using System.Globalization;
+using CommunityToolkit.Mvvm.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection;
 using System.IO;
 using System.Text.Json;
 using System.Windows;
-using CommunityToolkit.Mvvm.DependencyInjection;
-using Microsoft.Extensions.DependencyInjection;
 using WPFBeginner.Configurations;
 using WPFBeginner.Exceptions;
 using WPFBeginner.Services;
@@ -38,7 +36,7 @@ namespace WPFBeginner
                 Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
                 App.Current.MainWindow.Show();
             }
-            catch(Exception ex)
+            catch (Exception ex)
             {
                 App.Current.MainWindow.Close();
                 Environment.Exit(0);
@@ -47,7 +45,7 @@ namespace WPFBeginner
 
         private void UnhandledExceptionHandle(object e)
         {
-            if(e is UnhandledExceptionEventArgs uee && uee.ExceptionObject is LoginFailedException)
+            if (e is UnhandledExceptionEventArgs uee && uee.ExceptionObject is LoginFailedException)
             {
 
             }
@@ -86,7 +84,7 @@ namespace WPFBeginner
         private static void SetLanguage(string code)
         {
             if (_currentLanguage != null)
-                App.Current.Resources.MergedDictionaries.Remove( _currentLanguage );
+                App.Current.Resources.MergedDictionaries.Remove(_currentLanguage);
 
             _currentLanguage = ResourceExplorer.GetLanguageResourceDic(code);
             App.Current.Resources.MergedDictionaries.Add(_currentLanguage);
diff --git a/src/WPFEduSolution/WPFBeginner/Behaviors/WindowBehavior.cs b/src/WPFEduSolution/WPFBeginner/Behaviors/WindowBehavior.cs
index 366ab09..a892e0d 100644
--- a/src/WPFEduSolution/WPFBeginner/Behaviors/WindowBehavior.cs
+++ b/src/WPFEduSolution/WPFBeginner/Behaviors/WindowBehavior.cs
@@ -1,6 +1,6 @@
 using System.Runtime.InteropServices;
-using System.Windows.Interop;
 using System.Windows;
+using System.Windows.Interop;
 
 namespace WPFBeginner.Behaviors
 {
@@ -24,7 +24,8 @@ namespace WPFBeginner.Behaviors
 
         #region HideCloseButton (attached property)
 
-        private static readonly RoutedEventHandler HideCloseButtonWhenLoadedDelegate = (sender, args) => {
+        private static readonly RoutedEventHandler HideCloseButtonWhenLoadedDelegate = (sender, args) =>
+        {
             if (sender is Window == false)
                 return;
 
@@ -33,7 +34,8 @@ namespace WPFBeginner.Behaviors
             w.Loaded -= HideCloseButtonWhenLoadedDelegate;
         };
 
-        private static readonly RoutedEventHandler ShowCloseButtonWhenLoadedDelegate = (sender, args) => {
+        private static readonly RoutedEventHandler ShowCloseButtonWhenLoadedDelegate = (sender, args) =>
+        {
             if (sender is Window == false)
                 return;
 
@@ -43,7 +45,7 @@ namespace WPFBeginner.Behaviors
         };
 
         public static readonly DependencyProperty HideCloseButtonProperty =
-            DependencyProperty.RegisterAttached("HideCloseButton", typeof(bool), OwnerType, 
+            DependencyProperty.RegisterAttached("HideCloseButton", typeof(bool), OwnerType,
                 new FrameworkPropertyMetadata(false, new PropertyChangedCallback(HideCloseButtonChangedCallback)));
 
         [AttachedPropertyBrowsableForType(typeof(Window))]
@@ -97,7 +99,7 @@ namespace WPFBeginner.Behaviors
         #region IsHiddenCloseButton (readonly attached property)
 
         private static readonly DependencyPropertyKey IsHiddenCloseButtonKey =
-            DependencyProperty.RegisterAttachedReadOnly( "IsHiddenCloseButton", typeof(bool), OwnerType, new FrameworkPropertyMetadata(false));
+            DependencyProperty.RegisterAttachedReadOnly("IsHiddenCloseButton", typeof(bool), OwnerType, new FrameworkPropertyMetadata(false));
 
         public static readonly DependencyProperty IsHiddenCloseButtonProperty = IsHiddenCloseButtonKey.DependencyProperty;
 
diff --git a/src/WPFEduSolution/WPFBeginner/Configurations/AppSettings.cs b/src/WPFEduSolution/WPFBeginner/Configurations/AppSettings.cs
index d58bf69..0c0cec4 100644
--- a/src/WPFEduSolution/WPFBeginner/Configurations/AppSettings.cs
+++ b/src/WPFEduSolution/WPFBeginner/Configurations/AppSettings.cs
@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Text.Json.Serialization;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Text.Json.Serialization;
 using WPFBeginner.Models;
 
 namespace WPFBeginner.Configurations
@@ -15,7 +9,7 @@ namespace WPFBeginner.Configurations
         public EventHandler<StringChangedEventArg> ThemeChanged;
 
         [JsonPropertyName("Login")]
-        public LoginInfo Login { get; set;}
+        public LoginInfo Login { get; set; }
 
         private string language;
         [JsonPropertyName("Language")]
@@ -62,7 +56,7 @@ namespace WPFBeginner.Configurations
         }
 
         [JsonPropertyName("DefaultMembers")]
-        public List<Member> Members { get; set;}
+        public List<Member> Members { get; set; }
     }
 
     public class StringChangedEventArg : EventArgs
diff --git a/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml b/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml
index b6f1aca..1d94db5 100644
--- a/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml
+++ b/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml
@@ -3,7 +3,6 @@
              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:WPFBeginner.Controls"
              mc:Ignorable="d" Name="root"
              d:DesignHeight="450" d:DesignWidth="800">
     
diff --git a/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml.cs b/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml.cs
index de0aebd..977a145 100644
--- a/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml.cs
+++ b/src/WPFEduSolution/WPFBeginner/Controls/MemberInputPanel.xaml.cs
@@ -1,18 +1,5 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows;
+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 WPFBeginner.Controls
 {
@@ -22,7 +9,7 @@ namespace WPFBeginner.Controls
     public partial class MemberInputPanel : UserControl
     {
         public static readonly DependencyProperty MemberNameProperty =
-            DependencyProperty.Register(nameof(MemberName), typeof(string), typeof(MemberInputPanel), new FrameworkPropertyMetadata(){BindsTwoWayByDefault = true});
+            DependencyProperty.Register(nameof(MemberName), typeof(string), typeof(MemberInputPanel), new FrameworkPropertyMetadata() { BindsTwoWayByDefault = true });
 
         public string MemberName
         {
diff --git a/src/WPFEduSolution/WPFBeginner/Converters/BaseConverter.cs b/src/WPFEduSolution/WPFBeginner/Converters/BaseConverter.cs
index 69cca88..a9e53b6 100644
--- a/src/WPFEduSolution/WPFBeginner/Converters/BaseConverter.cs
+++ b/src/WPFEduSolution/WPFBeginner/Converters/BaseConverter.cs
@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows.Markup;
+using System.Windows.Markup;
 
 namespace WPFBeginner.Converters
 {
diff --git a/src/WPFEduSolution/WPFBeginner/Exceptions/LoginFailedException.cs b/src/WPFEduSolution/WPFBeginner/Exceptions/LoginFailedException.cs
index b98f160..aa759a7 100644
--- a/src/WPFEduSolution/WPFBeginner/Exceptions/LoginFailedException.cs
+++ b/src/WPFEduSolution/WPFBeginner/Exceptions/LoginFailedException.cs
@@ -1,16 +1,10 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace WPFBeginner.Exceptions
+namespace WPFBeginner.Exceptions
 {
     internal class LoginFailedException : Exception
     {
-        public LoginFailedException() : base() 
+        public LoginFailedException() : base()
         {
-            
+
         }
     }
 }
diff --git a/src/WPFEduSolution/WPFBeginner/Models/Member.cs b/src/WPFEduSolution/WPFBeginner/Models/Member.cs
index 4813ed0..7bc0631 100644
--- a/src/WPFEduSolution/WPFBeginner/Models/Member.cs
+++ b/src/WPFEduSolution/WPFBeginner/Models/Member.cs
@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Text;
-using System.Text.Json.Serialization;
-using System.Threading.Tasks;
+using System.Text.Json.Serialization;
 
 namespace WPFBeginner.Models
 {
@@ -26,7 +20,8 @@ namespace WPFBeginner.Models
                 Name = name,
                 Call = call,
                 EMail = email,
-                EmployeeNo = employeeNo };
+                EmployeeNo = employeeNo
+            };
         }
     }
 }
diff --git a/src/WPFEduSolution/WPFBeginner/Resources/SharedResourceDictionary.cs b/src/WPFEduSolution/WPFBeginner/Resources/SharedResourceDictionary.cs
index 078f976..ed2dfa1 100644
--- a/src/WPFEduSolution/WPFBeginner/Resources/SharedResourceDictionary.cs
+++ b/src/WPFEduSolution/WPFBeginner/Resources/SharedResourceDictionary.cs
@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows;
+using System.Windows;
 
 namespace WPFBeginner.Resources
 {
diff --git a/src/WPFEduSolution/WPFBeginner/Services/EnterFocusAssistanct.cs b/src/WPFEduSolution/WPFBeginner/Services/EnterFocusAssistanct.cs
index b6758b2..7a0f291 100644
--- a/src/WPFEduSolution/WPFBeginner/Services/EnterFocusAssistanct.cs
+++ b/src/WPFEduSolution/WPFBeginner/Services/EnterFocusAssistanct.cs
@@ -1,5 +1,5 @@
-using System.Windows.Input;
-using System.Windows;
+using System.Windows;
+using System.Windows.Input;
 
 namespace WPFBeginner.Services
 {
@@ -26,7 +26,7 @@ namespace WPFBeginner.Services
         private static void Unloaded(object sender, RoutedEventArgs e)
         {
             var uiElement = sender as FrameworkElement;
-            if (uiElement == null) 
+            if (uiElement == null)
                 return;
 
             uiElement.Unloaded -= Unloaded;
diff --git a/src/WPFEduSolution/WPFBeginner/Services/PasswordBoxAssistant.cs b/src/WPFEduSolution/WPFBeginner/Services/PasswordBoxAssistant.cs
index 8e07227..7c814d7 100644
--- a/src/WPFEduSolution/WPFBeginner/Services/PasswordBoxAssistant.cs
+++ b/src/WPFEduSolution/WPFBeginner/Services/PasswordBoxAssistant.cs
@@ -1,5 +1,5 @@
-using System.Windows.Controls;
-using System.Windows;
+using System.Windows;
+using System.Windows.Controls;
 
 namespace WPFBeginner.Services
 {
@@ -90,6 +90,6 @@ namespace WPFBeginner.Services
 
 
 
-        
+
     }
 }
diff --git a/src/WPFEduSolution/WPFBeginner/Services/ResourceExplorer.cs b/src/WPFEduSolution/WPFBeginner/Services/ResourceExplorer.cs
index b16b68f..432aba1 100644
--- a/src/WPFEduSolution/WPFBeginner/Services/ResourceExplorer.cs
+++ b/src/WPFEduSolution/WPFBeginner/Services/ResourceExplorer.cs
@@ -1,12 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using System.Windows;
-using System.Windows.Media;
+using System.Windows;
 
 namespace WPFBeginner.Services
 {
@@ -24,7 +16,7 @@ namespace WPFBeginner.Services
 
         public static void ChangeXamlResource(string oldRes, string newRes)
         {
-            var found = App.Current.Resources.MergedDictionaries.Select((item, i) => new { Item = item, Index = i}).FirstOrDefault(i => i.Item.Source.AbsoluteUri.Equals($"{oldRes}", StringComparison.OrdinalIgnoreCase));
+            var found = App.Current.Resources.MergedDictionaries.Select((item, i) => new { Item = item, Index = i }).FirstOrDefault(i => i.Item.Source.AbsoluteUri.Equals($"{oldRes}", StringComparison.OrdinalIgnoreCase));
             if (found == null)
                 return;
 
@@ -53,7 +45,7 @@ namespace WPFBeginner.Services
             //var foundName = $"/WPFBeginner;component/Themes/Colors/{name}.xaml";
             var found = App.Current.Resources.MergedDictionaries.Select((item, i) => new { Item = item, Index = i }).FirstOrDefault(i => i.Item.Source.AbsoluteUri.Equals(foundName, StringComparison.OrdinalIgnoreCase));
             if (found == null)
-                return new ResourceDictionary(){ Source = new Uri(foundName, UriKind.RelativeOrAbsolute) };
+                return new ResourceDictionary() { Source = new Uri(foundName, UriKind.RelativeOrAbsolute) };
 
             return found.Item;
         }
diff --git a/src/WPFEduSolution/WPFBeginner/Services/ViewModelLocator.cs b/src/WPFEduSolution/WPFBeginner/Services/ViewModelLocator.cs
index f28ad5d..b05dd1c 100644
--- a/src/WPFEduSolution/WPFBeginner/Services/ViewModelLocator.cs
+++ b/src/WPFEduSolution/WPFBeginner/Services/ViewModelLocator.cs
@@ -1,9 +1,4 @@
 using CommunityToolkit.Mvvm.DependencyInjection;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using WPFBeginner.ViewModels;
 
 namespace WPFBeginner.Services
diff --git a/src/WPFEduSolution/WPFBeginner/Spec.txt b/src/WPFEduSolution/WPFBeginner/Spec.txt
deleted file mode 100644
index 9d3e2be..0000000
--- a/src/WPFEduSolution/WPFBeginner/Spec.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-
-
-## 요구사항
-
-1. 프로그램 중복실행 방지
-2. 로그인 화면
-   - 파일로부터 데이터 읽어와 비교
-3. 
diff --git a/src/WPFEduSolution/WPFBeginner/ViewModels/MainWindowViewModel.cs b/src/WPFEduSolution/WPFBeginner/ViewModels/MainWindowViewModel.cs
index f05f002..b03f63d 100644
--- a/src/WPFEduSolution/WPFBeginner/ViewModels/MainWindowViewModel.cs
+++ b/src/WPFEduSolution/WPFBeginner/ViewModels/MainWindowViewModel.cs
@@ -16,7 +16,7 @@ namespace WPFBeginner.ViewModels
         {
             get
             {
-                if(filterMemebers != null)
+                if (filterMemebers != null)
                     return filterMemebers;
 
                 return members;
@@ -92,7 +92,7 @@ namespace WPFBeginner.ViewModels
                 return;
             }
 
-            IEnumerable<Member> result = Members;    
+            IEnumerable<Member> result = Members;
 
             if (!string.IsNullOrWhiteSpace(MemberName))
                 result = result.Where(i => i.Name?.Contains(MemberName) ?? false);
diff --git a/src/WPFEduSolution/WPFBeginner/ViewModels/RegistMemberWindowViewModel.cs b/src/WPFEduSolution/WPFBeginner/ViewModels/RegistMemberWindowViewModel.cs
index 8b31d2d..e247631 100644
--- a/src/WPFEduSolution/WPFBeginner/ViewModels/RegistMemberWindowViewModel.cs
+++ b/src/WPFEduSolution/WPFBeginner/ViewModels/RegistMemberWindowViewModel.cs
@@ -1,11 +1,8 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
-using System.ComponentModel;
-using System.Diagnostics;
 using System.Windows;
 using System.Windows.Input;
 using WPFBeginner.Services;
-using WPFBeginner.Views;
 
 namespace WPFBeginner.ViewModels
 {
diff --git a/src/WPFEduSolution/WPFBeginner/Views/MainWindow.xaml.cs b/src/WPFEduSolution/WPFBeginner/Views/MainWindow.xaml.cs
index b959e59..d1e900e 100644
--- a/src/WPFEduSolution/WPFBeginner/Views/MainWindow.xaml.cs
+++ b/src/WPFEduSolution/WPFBeginner/Views/MainWindow.xaml.cs
@@ -1,13 +1,4 @@
-using System.Text;
-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;
+using System.Windows;
 
 namespace WPFBeginner
 {
diff --git a/src/WPFEduSolution/WPFBeginner/Views/RegistMemberWindow.xaml.cs b/src/WPFEduSolution/WPFBeginner/Views/RegistMemberWindow.xaml.cs
index 58cb01b..bb0c8c3 100644
--- a/src/WPFEduSolution/WPFBeginner/Views/RegistMemberWindow.xaml.cs
+++ b/src/WPFEduSolution/WPFBeginner/Views/RegistMemberWindow.xaml.cs
@@ -1,16 +1,4 @@
-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;
+using System.Windows;
 
 namespace WPFBeginner.Views
 {