Initial version of the program

.gitattributes

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+# Everything is text unless it isn’t
+* text=auto
+
+# This is really text
+*.cs text
+*.xaml text
+
+# This is Windows-specific and should always have CRLF
+*.sln text eol=crlf
+*.csproj text eol=crlf
+*.resx text eol=crlf

.gitignore

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+.vs/
+*.v12.suo
+*.VC.db
+*.VC.opendb
+*.vcxproj.user
+*.csproj.user
+
+bin/
+obj/

Program.cs

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+using chocolatey;
+using chocolatey.infrastructure.logging;
+using System;
+using System.Diagnostics;
+using System.Reflection;
+using System.Security.Principal;
+
+namespace install_chocolatey
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            // If not running with elevated privileges, try to acquire them
+            var identity = WindowsIdentity.GetCurrent();
+            var principal = new WindowsPrincipal(identity);
+            if (!principal.IsInRole(WindowsBuiltInRole.Administrator))
+            {
+                Process p = new Process();
+                p.StartInfo.FileName = Assembly.GetExecutingAssembly().Location;
+                p.StartInfo.Verb = "runas"; // elevated privileges
+                p.StartInfo.UseShellExecute = true;
+                try
+                {
+                    p.Start();
+                    return;
+                }
+                catch
+                {
+                    Console.WriteLine("Error: must be run as administrator");
+                }
+            }
+            else
+            {
+                // Set this environment variable to a sensible default value, otherwise chocolatey.lib will use the executable location
+                if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("ChocolateyInstall")))
+                    Environment.SetEnvironmentVariable("ChocolateyInstall", @"C:\ProgramData\chocolatey");
+
+                var choco = Lets.GetChocolatey();
+                choco.SetCustomLogging(new NullLog());
+
+                choco.Set(conf => conf.CommandName = "upgrade");
+                choco.RunConsole(new string[] { "-y", "--force", "chocolatey" });
+                choco.RunConsole(new string[] { "-y", "--force", "chocolatey-gui" });
+
+                Console.Write("\n\nSetup was successful. Press any key to quit.\n");
+            }
+
+            Console.ReadKey();
+        }
+    }
+}

install-chocolatey.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <ProjectGuid>{E0F8D1D0-B649-476B-860A-3D17D42475F9}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>install_chocolatey</RootNamespace>
+    <TargetFramework>net48</TargetFramework>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <AssemblyTitle>install-chocolatey</AssemblyTitle>
+    <Product>install-chocolatey</Product>
+    <Copyright>Copyright ©  2021</Copyright>
+    <OutputPath>bin\$(Configuration)\</OutputPath>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugType>full</DebugType>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Net.Http" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="chocolatey.lib" Version="0.11.2" />
+    <PackageReference Include="GitVersion.MsBuild" Version="5.7.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="log4net" Version="2.0.12" />
+  </ItemGroup>
+</Project>

install-chocolatey.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31729.503
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "install-chocolatey", "install-chocolatey.csproj", "{E0F8D1D0-B649-476B-860A-3D17D42475F9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E0F8D1D0-B649-476B-860A-3D17D42475F9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E0F8D1D0-B649-476B-860A-3D17D42475F9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E0F8D1D0-B649-476B-860A-3D17D42475F9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E0F8D1D0-B649-476B-860A-3D17D42475F9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {040DE2E6-CBBE-43EC-88EB-2B64390F9752}
+	EndGlobalSection
+EndGlobal