diff --git a/MCTG/MCTGApp/Program.cs b/MCTG/MCTGApp/Program.cs
index 57a3a18..9998a9b 100644
--- a/MCTG/MCTGApp/Program.cs
+++ b/MCTG/MCTGApp/Program.cs
@@ -29,7 +29,7 @@ Console.WriteLine("test overload of [] operator:");
 try
 {
     rc[2].DisplayId();
-    rc.GetById(14).DisplayId();
+    rc.GetById(110).DisplayId();
 }
 catch (ArgumentNullException)
 {
@@ -51,5 +51,5 @@ RecipeCollection rc2 = new RecipeCollection(
 Console.WriteLine("test of Enumerable property:");
 foreach (Recipe r in rc2)
 {
-    r.DisplayId(); Console.Write(" - ");
+    r.DisplayId();
 }
diff --git a/MCTG/MCTGLib/RecipeCollection.cs b/MCTG/MCTGLib/RecipeCollection.cs
index c9ed6be..0611a0f 100644
--- a/MCTG/MCTGLib/RecipeCollection.cs
+++ b/MCTG/MCTGLib/RecipeCollection.cs
@@ -39,7 +39,7 @@ namespace Model
         public RecipeCollection(params Recipe[] recipes)
             : base(ComputeId())
         {
-            _recipes.CopyTo(recipes, 0);
+            _recipes = new List<Recipe>(recipes);
         }
 
         #endregion
@@ -116,7 +116,7 @@ namespace Model
 
         IEnumerator IEnumerable.GetEnumerator()
         {
-            return _recipes.GetEnumerator();
+            return this.GetEnumerator();
         }
 
         #endregion