Projektdateien hinzufügen.

WindowsFormsApp1/classes/ATextBox.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using WindowsFormsApp1.Test;
+
+namespace WindowsFormsApp1.classes
+{
+    public abstract class ABaseTexBox : TextBox
+    {
+        public virtual void Reset() => Text = string.Empty;
+
+        private protected void ResetProperties()
+        {
+            Name = string.Empty;
+            Description = string.Empty;
+        }
+
+        abstract public string Description { get; set; }
+    }
+}