diff --git a/Exercises_C_Sharp_Lections.csproj b/Exercises_C_Sharp_Lections.csproj
index 91b464a..f02677b 100644
--- a/Exercises_C_Sharp_Lections.csproj
+++ b/Exercises_C_Sharp_Lections.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>
diff --git a/Program.cs b/Program.cs
index ae7e7b9..1f91a35 100644
--- a/Program.cs
+++ b/Program.cs
@@ -174,7 +174,11 @@ namespace Exercises_C_Sharp
             //************************
             ExerciseGroup flowchartElements = new()
             {
-                Name = "9. Flowcharts"
+                Name = "9. Flowcharts",
+                ElementList = new()
+                {
+                    new(){Name = "Übung 1", Method = E18_Methods.Exercise_1.Start}
+                }
             };
             
 
@@ -186,15 +190,15 @@ namespace Exercises_C_Sharp
             ExerciseGroup methodsElements = new()
             {
                 Name = "18. Methoden",
-                ElementList =
-                [
+                ElementList = new()
+                {
                     new(){Name = "Übung 1", Method = E18_Methods.Exercise_1.Start},
                     new(){Name = "Übung 2", Method = E18_Methods.Exercise_2.Start},
                     new(){Name = "Übung 3", Method = E18_Methods.Exercise_3.Start},
                     new(){Name = "Übung 4", Method = E18_Methods.Exercise_4.Start},
                     new(){Name = "Übung 5", Method = E18_Methods.Exercise_5.Start},
                     new(){Name = "Übung 6", Method = E18_Methods.Exercise_6.Start}
-                ]
+                }
             };
             
             //************************
@@ -236,6 +240,24 @@ namespace Exercises_C_Sharp
                 }
             };
             //************************
+            //*********Sorting**********
+            //************************
+            ExerciseGroup sortingElements = new ExerciseGroup()
+            {
+                Name = "21. Sortieren",
+                ElementList = new List<ExerciseElement>()
+                {
+                    new(){Name = "Übung 1", Method = E21_Sorting.Exercise_1.Start},
+                    new(){Name = "Übung 2", Method = E21_Sorting.Exercise_2.Start},
+                    new(){Name = "Übung 3", Method = E21_Sorting.Exercise_3.Start},
+                    new(){Name = "Übung 4", Method = E21_Sorting.Exercise_4.Start},
+                    new(){Name = "Übung 5", Method = E21_Sorting.Exercise_5.Start},
+                    new(){Name = "Übung 6", Method = E21_Sorting.Exercise_6.Start},
+                    new(){Name = "Übung 7", Method = E21_Sorting.Exercise_7.Start},
+                    new(){Name = "Übung 8", Method = E21_Sorting.Exercise_8.Start}
+                }
+            };
+            //************************
             //*********Enums**********
             //************************
             ExerciseGroup enumElements = new ExerciseGroup()
@@ -258,6 +280,7 @@ namespace Exercises_C_Sharp
                     new ExerciseElement(){Name = "Übung 13", Method = E24_Enumns.Exercise_13.Start}
                 }
             };
+            
             //************************
             //*********Tuple**********
             //************************
@@ -506,6 +529,7 @@ namespace Exercises_C_Sharp
                 methodsElements,
                 
                 listElements,
+                sortingElements,
                 enumElements,
                 ueberladungElements,
                 moredimensionalArrayElements,