Projektdateien hinzufügen.

WindowsFormsApp1/Form1.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using WindowsFormsApp1.OP;
+
+namespace WindowsFormsApp1
+{
+    public partial class Form1 : Form
+    {
+        Subject<string> Subject = new Subject<string>();
+
+        public Form1()
+        {
+            InitializeComponent();
+            Subject.Subscribe(new ClassObserver());
+            Subject.Subscribe(new PropertyObserver()); 
+        }
+
+        private void baseTextBox1_TextChanged(object sender, EventArgs e)
+        {
+            Subject.SetState(baseTextBox1.Text);
+        }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            baseTextBox1.Reset();
+        }
+
+        private void button2_Click(object sender, EventArgs e)
+        {
+            extendedTB1.Reset();
+        }
+    }
+}