Projektdateien hinzufügen.

WindowsFormsApp1/Test/BaseTextBox.cs

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+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using WindowsFormsApp1.classes;
+using WindowsFormsApp1.OP;
+
+namespace WindowsFormsApp1.Test
+{
+    public class BaseTextBox : ABaseTexBox, OP.IObserver<string>
+    {
+        public BaseTextBox() : base()
+        {
+            ForeColor = Color.White;
+            BackColor = Color.DarkOrange;
+        }
+
+        public override string Description { get; set; }
+
+        public void Update(ISubject<string> subject)
+        {
+
+            MessageBox.Show(subject.GetState());
+        }
+    }
+}