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ExL.AccessModifier/ExL.AccessModifier.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ExL.AccessModifier/Program.cs

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+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        var mycls = new MyClass();
+        mycls.Name = "철수";
+        mycls.Run(100);
+        //mycls._id = 100; //에러
+        //mycls.Execute() //에러
+    }
+
+
+    internal class MyClass
+    {
+        private int _id = 0;
+
+        public string Name { get; set; }
+
+        public void Run(int id) { }
+
+        protected void Execute() { }
+    }
+
+}