diff --git a/01KlassenWiederholung/obj/Debug/netcoreapp3.1/01KlassenWiederholung.csprojAssemblyReference.cache b/01KlassenWiederholung/obj/Debug/netcoreapp3.1/01KlassenWiederholung.csprojAssemblyReference.cache
index 28d58aefeb25d096925a91f2b9e911eda0e4c6ed..9bb701fecadc48763763df796398b7861ff2f7ec 100644
Binary files a/01KlassenWiederholung/obj/Debug/netcoreapp3.1/01KlassenWiederholung.csprojAssemblyReference.cache and b/01KlassenWiederholung/obj/Debug/netcoreapp3.1/01KlassenWiederholung.csprojAssemblyReference.cache differ
diff --git a/01OperatorOverloading/obj/Debug/netcoreapp3.1/01OperatorOverloading.csprojAssemblyReference.cache b/01OperatorOverloading/obj/Debug/netcoreapp3.1/01OperatorOverloading.csprojAssemblyReference.cache
index 308f84f1bd32b1f7e1467356eb1ac40d7da08d5e..baab94ac361f7cb1eaaa590c9a0a6503cd61bd2c 100644
Binary files a/01OperatorOverloading/obj/Debug/netcoreapp3.1/01OperatorOverloading.csprojAssemblyReference.cache and b/01OperatorOverloading/obj/Debug/netcoreapp3.1/01OperatorOverloading.csprojAssemblyReference.cache differ
diff --git a/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.cache b/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.cache
index f9c06ca50e09159bd87b38a5a0c484a04731f8c6..673b34cea2cac216624a6abe997a252862101b48 100644
--- a/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.cache
+++ b/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.cache
@@ -4,17 +4,17 @@
 winexe
 C#
 .cs
-C:\Users\wienkop\source\repos\01WPF_Demo\obj\Debug\
+C:\Users\wienkop\source\repos\prog2-ss2020-wienkop\01WPF_Demo\obj\Debug\
 _01WPF_Demo
 none
 false
 DEBUG;TRACE
-C:\Users\wienkop\source\repos\01WPF_Demo\App.xaml
+C:\Users\wienkop\source\repos\prog2-ss2020-wienkop\01WPF_Demo\App.xaml
 11151548125
 
-5-2017746502
+6-1369348151
 13-1505183044
 MainWindow.xaml;
 
-False
+True
 
diff --git a/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.lref b/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.lref
index 11e1c69db21bed9e6e9c619cdf3a4f181c51218a..684a2178022e72432efd5dd436e7adca60c2354e 100644
--- a/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.lref
+++ b/01WPF_Demo/obj/Debug/01WPF_Demo_MarkupCompile.lref
@@ -1,4 +1,4 @@
 
 
-FC:\Users\wienkop\source\repos\01WPF_Demo\MainWindow.xaml;;
+FC:\Users\wienkop\source\repos\prog2-ss2020-wienkop\01WPF_Demo\MainWindow.xaml;;
 
diff --git a/01WPF_Demo/obj/Debug/MainWindow.baml b/01WPF_Demo/obj/Debug/MainWindow.baml
deleted file mode 100644
index 275dd8523a27e556370b36ad0b8c66af39ffa395..0000000000000000000000000000000000000000
Binary files a/01WPF_Demo/obj/Debug/MainWindow.baml and /dev/null differ
diff --git a/02 UebgDi Klassse TimeOpOverloading/obj/Debug/netcoreapp3.1/02 UebgDi Klassse TimeOpOverloading.csprojAssemblyReference.cache b/02 UebgDi Klassse TimeOpOverloading/obj/Debug/netcoreapp3.1/02 UebgDi Klassse TimeOpOverloading.csprojAssemblyReference.cache
index d7dd684443de8ada82f92a8e0cf14a64b9096fd6..a0fbfd12797557adefa2aaaacd9d5126dec64303 100644
Binary files a/02 UebgDi Klassse TimeOpOverloading/obj/Debug/netcoreapp3.1/02 UebgDi Klassse TimeOpOverloading.csprojAssemblyReference.cache and b/02 UebgDi Klassse TimeOpOverloading/obj/Debug/netcoreapp3.1/02 UebgDi Klassse TimeOpOverloading.csprojAssemblyReference.cache differ
diff --git a/02VerketteteListe-2/Program.cs b/02VerketteteListe-2/Program.cs
index 7e723065549c56e345f9c684863ffa8bead20d01..9f67ed7194171c457d817383ac7acf9f3c6dba8d 100644
--- a/02VerketteteListe-2/Program.cs
+++ b/02VerketteteListe-2/Program.cs
@@ -12,7 +12,7 @@ namespace _02VerketteteListe_2
         {
             public string name;
             public Element(string name) { this.name = name; }
-            public Element next;    // WAS IST NEXT???
+            public Element next = null;    // WAS IST NEXT???
             public override string ToString() => name;
         }
 
diff --git a/prog2-ss2020-wienkop.sln b/prog2-ss2020-wienkop.sln
new file mode 100644
index 0000000000000000000000000000000000000000..16f557b7601c9614f41a88e78d0d3b984f461742
--- /dev/null
+++ b/prog2-ss2020-wienkop.sln
@@ -0,0 +1,90 @@
+
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+EndProject
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+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "01KlassenWiederholung", "01KlassenWiederholung\01KlassenWiederholung.csproj", "{0AD7D64F-B6B4-48D0-AD0B-AAB123D98F99}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "01OperatorOverloading", "01OperatorOverloading\01OperatorOverloading.csproj", "{3C1CF7BC-0D5F-46C6-B162-6BA196D4463B}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "01OperatorTrueFalse", "01OperatorTrueFalse\01OperatorTrueFalse.csproj", "{5A0DEC41-89DA-425F-B4BA-FB667000276E}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{B17BE0CE-5DB3-4797-8D99-219A64F223CB}"
+	ProjectSection(SolutionItems) = preProject
+		01Overloadable Operators.txt = 01Overloadable Operators.txt
+	EndProjectSection
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "01WPF_Demo", "01WPF_Demo\01WPF_Demo.csproj", "{2D7F68A9-437F-4344-873C-CFF10C4F07BB}"
+EndProject
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+EndProject
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+EndProject
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+EndProject
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+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{FBADFD92-F268-4F6D-A79A-068F912CC45C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FBADFD92-F268-4F6D-A79A-068F912CC45C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FBADFD92-F268-4F6D-A79A-068F912CC45C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FBADFD92-F268-4F6D-A79A-068F912CC45C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F073FE54-51ED-4F82-8270-CCE831190B76}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F073FE54-51ED-4F82-8270-CCE831190B76}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{0AD7D64F-B6B4-48D0-AD0B-AAB123D98F99}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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+		{0AD7D64F-B6B4-48D0-AD0B-AAB123D98F99}.Release|Any CPU.Build.0 = Release|Any CPU
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+		{3C1CF7BC-0D5F-46C6-B162-6BA196D4463B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3C1CF7BC-0D5F-46C6-B162-6BA196D4463B}.Release|Any CPU.ActiveCfg = Release|Any CPU
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+		{5A0DEC41-89DA-425F-B4BA-FB667000276E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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+		{C0DCC378-E2E8-4618-91B5-ECD6D0838A1C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C0DCC378-E2E8-4618-91B5-ECD6D0838A1C}.Debug|Any CPU.Build.0 = Debug|Any CPU
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+		{EC53AD78-5283-4784-8F93-49AF021BC2DC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EC53AD78-5283-4784-8F93-49AF021BC2DC}.Release|Any CPU.ActiveCfg = Release|Any CPU
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+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
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+		SolutionGuid = {CB4F7DB1-16DA-4C10-9432-FC7B0CAD56E5}
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