diff --git a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/UserPrefs.xml b/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/UserPrefs.xml
deleted file mode 100644
index a84b2058..00000000
--- a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/UserPrefs.xml
+++ /dev/null
@@ -1,31 +0,0 @@
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-  <MonoDevelop.Ide.ItemProperties.Example01 PreferredExecutionTarget="MonoDevelop.Default" />
-  <MonoDevelop.Ide.Workbench ActiveDocument="SocketClient/Exercise.cs">
-    <Files>
-      <File FileName="MergeSort/Exercise.cs" Line="11" Column="10" />
-      <File FileName="SocketServer/Program.cs" Line="1" Column="1" />
-      <File FileName="SocketServer/Exercise.cs" Line="1" Column="1" />
-      <File FileName="SocketClient/Exercise.cs" Line="12" Column="29" />
-    </Files>
-    <Pads>
-      <Pad Id="ProjectPad">
-        <State name="__root__">
-          <Node name="ConcurrentCSharp" expanded="True">
-            <Node name="MergeSort" expanded="True" />
-            <Node name="SocketClient" expanded="True">
-              <Node name="Exercise.cs" selected="True" />
-            </Node>
-            <Node name="SocketServer" expanded="True" />
-          </Node>
-        </State>
-      </Pad>
-    </Pads>
-  </MonoDevelop.Ide.Workbench>
-  <MonoDevelop.Ide.DebuggingService.PinnedWatches />
-  <MonoDevelop.Ide.Workspace ActiveConfiguration="Debug" />
-  <MonoDevelop.Ide.DebuggingService.Breakpoints>
-    <BreakpointStore />
-  </MonoDevelop.Ide.DebuggingService.Breakpoints>
-  <MultiItemStartupConfigurations />
-  <MonoDevelop.Ide.ItemProperties.MergeSort PreferredExecutionTarget="MonoDevelop.Default" />
-</Properties>
\ No newline at end of file
diff --git a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/Example01-Debug.json b/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/Example01-Debug.json
deleted file mode 100644
index 2f439178..00000000
--- a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/Example01-Debug.json
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/MergeSort-Debug.json b/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/MergeSort-Debug.json
deleted file mode 100644
index 51a0e648..00000000
--- a/ConcurrentCSharp/.vs/ConcurrentCSharp/xs/project-cache/MergeSort-Debug.json
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index 326f4677..00000000
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index 9e572dc4..00000000
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app3.1/System.Threading.Tasks.Dataflow.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.Tasks.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.Tasks.Extensions.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.Tasks.Parallel.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.Thread.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.ThreadPool.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Threading.Timer.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Transactions.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Transactions.Local.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.ValueTuple.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Web.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Web.HttpUtility.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Windows.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.Linq.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.ReaderWriter.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.Serialization.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.XDocument.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.XmlDocument.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.XmlSerializer.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.XPath.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/System.Xml.XPath.XDocument.dll","Aliases":[],"Framework":null},{"FilePath":"/usr/local/share/dotnet/packs/Microsoft.NETCore.App.Ref/3.1.0/ref/netcoreapp3.1/WindowsBase.dll","Aliases":[],"Framework":null}],"Files":["/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/Exercise.cs","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/Program.cs","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/Program.cs~","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/Exercise.cs~","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/ProgramSol.cs~","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/obj/Debug/netcoreapp3.1/SocketServer.AssemblyInfo.cs","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/obj/Debug/netcoreapp3.1/SocketServer.AssemblyInfo.cs","/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/SocketServer/obj/Debug/netcoreapp3.1/SocketServer.AssemblyInfo.cs"],"BuildActions":["Compile","Compile","None","None","None","Compile","Compile","Compile"],"Analyzers":[],"AdditionalFiles":[],"EditorConfigFiles":[]}
\ No newline at end of file
diff --git a/ConcurrentCSharp/ConcurrentCSharp.sln b/ConcurrentCSharp/ConcurrentCSharp.sln
index b17df1fe..49b2084b 100644
--- a/ConcurrentCSharp/ConcurrentCSharp.sln
+++ b/ConcurrentCSharp/ConcurrentCSharp.sln
@@ -1,8 +1,6 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Example01", "Example01\Example01.csproj", "{B6E3BC81-6159-4CF1-AF0D-480F5EB1A7CB}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MergeSort", "MergeSort\MergeSort.csproj", "{7B485568-4C3F-4E8A-95E5-D39D475DD181}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SocketClient", "SocketClient\SocketClient.csproj", "{7463BA01-16EE-422A-BFE2-3B3AEAE48D17}"
@@ -15,10 +13,6 @@ Global
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{B6E3BC81-6159-4CF1-AF0D-480F5EB1A7CB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{B6E3BC81-6159-4CF1-AF0D-480F5EB1A7CB}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{B6E3BC81-6159-4CF1-AF0D-480F5EB1A7CB}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{B6E3BC81-6159-4CF1-AF0D-480F5EB1A7CB}.Release|Any CPU.Build.0 = Release|Any CPU
 		{7B485568-4C3F-4E8A-95E5-D39D475DD181}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{7B485568-4C3F-4E8A-95E5-D39D475DD181}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7B485568-4C3F-4E8A-95E5-D39D475DD181}.Release|Any CPU.ActiveCfg = Release|Any CPU
diff --git a/ConcurrentCSharp/Example01/Example01.csproj b/ConcurrentCSharp/Example01/Example01.csproj
deleted file mode 100644
index d453e9a0..00000000
--- a/ConcurrentCSharp/Example01/Example01.csproj
+++ /dev/null
@@ -1,8 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp3.1</TargetFramework>
-  </PropertyGroup>
-
-</Project>
diff --git a/ConcurrentCSharp/Example01/Program.cs b/ConcurrentCSharp/Example01/Program.cs
deleted file mode 100644
index eebc292e..00000000
--- a/ConcurrentCSharp/Example01/Program.cs
+++ /dev/null
@@ -1,12 +0,0 @@
-using System;
-
-namespace Example01
-{
-    class Program
-    {
-        static void Main(string[] args)
-        {
-            Console.WriteLine("Hello World!");
-        }
-    }
-}
diff --git a/ConcurrentCSharp/Example01/obj/Debug/netcoreapp3.1/Example01.assets.cache b/ConcurrentCSharp/Example01/obj/Debug/netcoreapp3.1/Example01.assets.cache
deleted file mode 100644
index c18869c4..00000000
Binary files a/ConcurrentCSharp/Example01/obj/Debug/netcoreapp3.1/Example01.assets.cache and /dev/null differ
diff --git a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.cache b/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.cache
deleted file mode 100644
index abe963d3..00000000
--- a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.cache
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "version": 1,
-  "dgSpecHash": "FOAhZZ89rwAEzEnkRqhD2BWQyjJZBnSNlYIqT+8Rsoxj+XwLDq/fwJmfFlOPUBtQleDaDaEUUZrqDOLOQSls6A==",
-  "success": true
-}
\ No newline at end of file
diff --git a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.dgspec.json b/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.dgspec.json
deleted file mode 100644
index d21155f0..00000000
--- a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.dgspec.json
+++ /dev/null
@@ -1,61 +0,0 @@
-{
-  "format": 1,
-  "restore": {
-    "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj": {}
-  },
-  "projects": {
-    "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj": {
-      "version": "1.0.0",
-      "restore": {
-        "projectUniqueName": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj",
-        "projectName": "Example01",
-        "projectPath": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj",
-        "packagesPath": "/Users/amighi/.nuget/packages/",
-        "outputPath": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/obj/",
-        "projectStyle": "PackageReference",
-        "fallbackFolders": [
-          "/usr/local/share/dotnet/sdk/NuGetFallbackFolder"
-        ],
-        "configFilePaths": [
-          "/Users/amighi/.config/NuGet/NuGet.Config"
-        ],
-        "originalTargetFrameworks": [
-          "netcoreapp3.1"
-        ],
-        "sources": {
-          "https://api.nuget.org/v3/index.json": {}
-        },
-        "frameworks": {
-          "netcoreapp3.1": {
-            "projectReferences": {}
-          }
-        },
-        "warningProperties": {
-          "warnAsError": [
-            "NU1605"
-          ]
-        }
-      },
-      "frameworks": {
-        "netcoreapp3.1": {
-          "imports": [
-            "net461",
-            "net462",
-            "net47",
-            "net471",
-            "net472",
-            "net48"
-          ],
-          "assetTargetFallback": true,
-          "warn": true,
-          "frameworkReferences": {
-            "Microsoft.NETCore.App": {
-              "privateAssets": "all"
-            }
-          },
-          "runtimeIdentifierGraphPath": "/usr/local/share/dotnet/sdk/3.1.200/RuntimeIdentifierGraph.json"
-        }
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.props b/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.props
deleted file mode 100644
index 423c5429..00000000
--- a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.props
+++ /dev/null
@@ -1,15 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="no"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
-    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
-    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
-    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
-    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">/Users/amighi/.nuget/packages/</NuGetPackageRoot>
-    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">/Users/amighi/.nuget/packages/;/usr/local/share/dotnet/sdk/NuGetFallbackFolder</NuGetPackageFolders>
-    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
-    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">5.4.0</NuGetToolVersion>
-  </PropertyGroup>
-  <PropertyGroup>
-    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
-  </PropertyGroup>
-</Project>
\ No newline at end of file
diff --git a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.targets b/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.targets
deleted file mode 100644
index 53cfaa19..00000000
--- a/ConcurrentCSharp/Example01/obj/Example01.csproj.nuget.g.targets
+++ /dev/null
@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="no"?>
-<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
-  </PropertyGroup>
-</Project>
\ No newline at end of file
diff --git a/ConcurrentCSharp/Example01/obj/project.assets.json b/ConcurrentCSharp/Example01/obj/project.assets.json
deleted file mode 100644
index 910de52f..00000000
--- a/ConcurrentCSharp/Example01/obj/project.assets.json
+++ /dev/null
@@ -1,67 +0,0 @@
-{
-  "version": 3,
-  "targets": {
-    ".NETCoreApp,Version=v3.1": {}
-  },
-  "libraries": {},
-  "projectFileDependencyGroups": {
-    ".NETCoreApp,Version=v3.1": []
-  },
-  "packageFolders": {
-    "/Users/amighi/.nuget/packages/": {},
-    "/usr/local/share/dotnet/sdk/NuGetFallbackFolder": {}
-  },
-  "project": {
-    "version": "1.0.0",
-    "restore": {
-      "projectUniqueName": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj",
-      "projectName": "Example01",
-      "projectPath": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/Example01.csproj",
-      "packagesPath": "/Users/amighi/.nuget/packages/",
-      "outputPath": "/Users/amighi/workspace/teaching/Courses/ConcurrentCSharp/Example01/obj/",
-      "projectStyle": "PackageReference",
-      "fallbackFolders": [
-        "/usr/local/share/dotnet/sdk/NuGetFallbackFolder"
-      ],
-      "configFilePaths": [
-        "/Users/amighi/.config/NuGet/NuGet.Config"
-      ],
-      "originalTargetFrameworks": [
-        "netcoreapp3.1"
-      ],
-      "sources": {
-        "https://api.nuget.org/v3/index.json": {}
-      },
-      "frameworks": {
-        "netcoreapp3.1": {
-          "projectReferences": {}
-        }
-      },
-      "warningProperties": {
-        "warnAsError": [
-          "NU1605"
-        ]
-      }
-    },
-    "frameworks": {
-      "netcoreapp3.1": {
-        "imports": [
-          "net461",
-          "net462",
-          "net47",
-          "net471",
-          "net472",
-          "net48"
-        ],
-        "assetTargetFallback": true,
-        "warn": true,
-        "frameworkReferences": {
-          "Microsoft.NETCore.App": {
-            "privateAssets": "all"
-          }
-        },
-        "runtimeIdentifierGraphPath": "/usr/local/share/dotnet/sdk/3.1.200/RuntimeIdentifierGraph.json"
-      }
-    }
-  }
-}
\ No newline at end of file
diff --git a/README.md b/README.md
index 697793e1..33f24b2e 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,2 @@
 # Courses
-This rep. contains my personal educational materials.
+This repository contains personal educational materials.