Projektdateien hinzufügen.

Persona2/Persona2.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+  </PropertyGroup>
+
+</Project>

Persona2/Program.cs

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+using System.Net.NetworkInformation;
+using System.Xml.Serialization;
+
+namespace Persona2
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Person p = new Person();
+            
+            p.SetName("Osama");
+            p.SetAge(35);
+            p.SayHello();
+            p.Birthday();
+            p.SayHello();
+
+            Person p2 = new Person();
+            p2.SetName("Polly");
+            p2.SetAge(27);
+            p2.SayHello();
+            p2.Birthday();
+            p2.SayHello();
+
+            Person p3 = new Person();
+            p3.SetName("Anton");
+            p3.SetAge(30);
+            p3.SayHello();
+            p3.Birthday();
+            p3.SayHello();
+
+            Console.WriteLine();
+            Console.WriteLine();
+        }
+
+        class Person
+        {
+            private int age;
+            private string name;
+            public string GetName() 
+            { return name; }
+            public void SetName(string n ) 
+            {
+                if (name == null)
+                { name = n; }
+            }
+            public int GetAge()
+            { return age; }
+            public void SetAge(int a) 
+            { 
+                if ( age == 0 && a > 0) { age = a; }
+            }
+            public void Birthday () 
+            { 
+                age++; 
+            }
+            public void SayHello() 
+            { 
+                Console.WriteLine($"Hallo mein Name ist {GetName()} und ich bin {GetAge()} Jahre alt.");
+            }
+        }
+
+    }
+}