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ExF.Class/ExF.Class.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>

ExF.Class/MyCustomer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExF.Class
+{
+    public class MyCustomer
+    {
+        // 필드
+        private string name;
+        private int age;
+
+        // 이벤트 
+        public event EventHandler NameChanged;
+
+        // 생성자 (Constructor)
+        public MyCustomer()
+        {
+            name = string.Empty;
+            age = -1;
+        }
+
+        // 속성
+        public string Name
+        {
+            get { return this.name; }
+            set
+            {
+                if (this.name != value)
+                {
+                    this.name = value;
+                    if (NameChanged != null)
+                    {
+                        NameChanged(this, EventArgs.Empty);
+                    }
+                }
+            }
+        }
+        public int Age
+        {
+            get { return this.age; }
+            set { this.age = value; }
+        }
+
+        // 메서드
+        public string GetCustomerData()
+        {
+            string data = string.Format("Name: {0} (Age: {1})",
+                        this.Name, this.Age);
+            return data;
+        }
+    }
+
+}

ExF.Class/Program.cs

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+using ExF.Class;
+
+internal class Program
+{
+    private static void Main(string[] args)
+    {
+        MyCustomer customer1 = new MyCustomer();
+        MyCustomer customer2 = new();
+        var customer3 = new MyCustomer();
+        
+        
+    }
+}