exeptions in WFA

WindowsFormsApp01/WindowsFormsApp01/Form1.cs

@@ -183,7 +183,22 @@ namespace WindowsFormsApp01
 
         private void Button4_Click(object sender, EventArgs e)
         {
-            calc.CalcIt();
+            try
+            {
+                calc.CalcIt();
+            }
+            catch (DivideByZeroException)
+            {
+                label4.Text = "Fehler: div by zero";
+            }
+            catch (Exception)
+            {
+
+
+                label4.Text = "Fehler";
+
+
+            }
         }
 
         public void CalcFinished(CalcEventArgs e)
@@ -214,6 +229,7 @@ namespace WindowsFormsApp01
         {
             int res = DateTime.Now.Second;
 
+            res = res / 0;
 
             var e = new CalcEventArgs(res);
             //trigger handler