diff --git a/BitMaskTest/.vscode/launch.json b/BitMaskTest/.vscode/launch.json
new file mode 100644
index 0000000..c56e81d
--- /dev/null
+++ b/BitMaskTest/.vscode/launch.json
@@ -0,0 +1,24 @@
+{
+    // IntelliSense를 사용하여 가능한 특성에 대해 알아보세요.
+    // 기존 특성에 대한 설명을 보려면 가리킵니다.
+    // 자세한 내용을 보려면 https://go.microsoft.com/fwlink/?linkid=830387을(를) 방문하세요.
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (console)",
+            "type": "coreclr",
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceFolder}/bin/Debug/net7.0/BitMaskTest.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}",
+            "console": "internalConsole",
+            "stopAtEntry": false
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/BitMaskTest/.vscode/tasks.json b/BitMaskTest/.vscode/tasks.json
new file mode 100644
index 0000000..ef008cf
--- /dev/null
+++ b/BitMaskTest/.vscode/tasks.json
@@ -0,0 +1,41 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "build",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "build",
+                "${workspaceFolder}/BitMaskTest.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "publish",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "publish",
+                "${workspaceFolder}/BitMaskTest.csproj",
+                "/property:GenerateFullPaths=true",
+                "/consoleloggerparameters:NoSummary"
+            ],
+            "problemMatcher": "$msCompile"
+        },
+        {
+            "label": "watch",
+            "command": "dotnet",
+            "type": "process",
+            "args": [
+                "watch",
+                "run",
+                "--project",
+                "${workspaceFolder}/BitMaskTest.csproj"
+            ],
+            "problemMatcher": "$msCompile"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/BitMaskTest/BitMaskTest.csproj b/BitMaskTest/BitMaskTest.csproj
index c73e0d1..120e38c 100644
--- a/BitMaskTest/BitMaskTest.csproj
+++ b/BitMaskTest/BitMaskTest.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
   </PropertyGroup>
 
 </Project>
diff --git a/BitMaskTest/PopupButtonMask.cs b/BitMaskTest/PopupButtonMask.cs
index 37db872..1b2eb7f 100644
--- a/BitMaskTest/PopupButtonMask.cs
+++ b/BitMaskTest/PopupButtonMask.cs
@@ -4,42 +4,55 @@ using System.Text;
 
 namespace BitMaskTest
 {
-	[Flags]
-	public enum ButtonMask
-	{
-		None = 0x00,
-		Remove = 0x01,
-		LevelUp = 0x02,
-		Change = 0x04,
-		Reset = 0x08,
-		Cancel = 0x10,
-	}
-
-	class PopupButtonMask
-	{
-		public ButtonMask Mask { get; set; } = ButtonMask.None;
-
-		public List<ButtonMask> GetButtons()
-		{
-			List<ButtonMask> buttons = new List<ButtonMask>();
-			foreach (ButtonMask flag in Enum.GetValues(typeof(ButtonMask)))
-			{
-				if (checkMask(flag))
-					buttons.Add(flag);
-			}
-
-			if (buttons == null || buttons.Count < 1)
-				return null;
-
-			return buttons;
-		}
-
-		private bool checkMask(ButtonMask compareTarget)
-		{
-			int flags = (int)this.Mask;
-			int flag = (int)compareTarget;
-
-			return (flags & flag) != 0;
-		}
-	}
+    // [Flags]
+    // public enum ButtonMask
+    // {
+    // 	None = 0x00,
+    // 	Remove = 0x01,
+    // 	LevelUp = 0x02,
+    // 	Change = 0x04,
+    // 	Reset = 0x08,
+    // 	Cancel = 0x10,
+    // }
+
+    [Flags]
+    public enum ButtonMask
+    {
+        None = 0,
+        Remove = 1 << 0,
+        LevelUp = 1 << 1,
+        Change = 1 << 2,
+        Reset = 1 << 3,
+        Cancel = 1 << 4,
+
+        All = int.MaxValue
+    }
+
+    class PopupButtonMask
+    {
+        public ButtonMask Mask { get; set; } = ButtonMask.None;
+
+        public List<ButtonMask> GetButtons()
+        {
+            List<ButtonMask> buttons = new List<ButtonMask>();
+            foreach (ButtonMask flag in Enum.GetValues(typeof(ButtonMask)))
+            {
+                if (checkMask(flag))
+                    buttons.Add(flag);
+            }
+
+            if (buttons == null || buttons.Count < 1)
+                return null;
+
+            return buttons;
+        }
+
+        public bool checkMask(ButtonMask compareTarget)
+        {
+            int flags = (int)this.Mask;
+            int flag = (int)compareTarget;
+
+            return (flags & flag) != 0;
+        }
+    }
 }
diff --git a/BitMaskTest/Program.cs b/BitMaskTest/Program.cs
index fa13804..3fa06a1 100644
--- a/BitMaskTest/Program.cs
+++ b/BitMaskTest/Program.cs
@@ -3,7 +3,7 @@ using System.Collections.Generic;
 
 namespace BitMaskTest
 {
-	/*
+    /*
 	 * AND &: 비트가 모두 1일 때 1 반환
 	 * 1011 & 1001 = 1001
 	 * 
@@ -20,20 +20,20 @@ namespace BitMaskTest
 	 * 001011 << 2 = 101100
 	 * 001011 >> 2 = 000010
 	 */
-	class Program
-	{
-		static void Main(string[] args)
-		{
-			PopupButtonMask popupButton = new PopupButtonMask();
-			popupButton.Mask = ButtonMask.LevelUp | ButtonMask.Reset | ButtonMask.Cancel | ButtonMask.Remove | ButtonMask.Change;
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            PopupButtonMask popupButton = new PopupButtonMask();
+            popupButton.Mask = ButtonMask.LevelUp | ButtonMask.Cancel | ButtonMask.Remove | ButtonMask.Change;
 
-			List<ButtonMask> buttons = popupButton.GetButtons();
-			foreach (ButtonMask item in buttons)
-			{
-				Console.WriteLine(item);
-			}
+            System.Console.WriteLine(popupButton.checkMask(ButtonMask.All));
 
-			Console.ReadKey();
-		}
-	}
+            // List<ButtonMask> buttons = popupButton.GetButtons();
+            // foreach (ButtonMask item in buttons)
+            // {
+            //     Console.WriteLine(item);
+            // }
+        }
+    }
 }