Add project files.

VirtualPythonC#.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.10.35027.167
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "VirtualPythonC#", "VirtualPythonC#\VirtualPythonC#.csproj", "{99A207FD-8A7B-403B-9CC6-7E0F31DEB75E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{99A207FD-8A7B-403B-9CC6-7E0F31DEB75E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{99A207FD-8A7B-403B-9CC6-7E0F31DEB75E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{99A207FD-8A7B-403B-9CC6-7E0F31DEB75E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{99A207FD-8A7B-403B-9CC6-7E0F31DEB75E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1523852C-5101-44F0-9A37-0FFE378559BA}
+	EndGlobalSection
+EndGlobal

VirtualPythonC#/Program.cs

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+// See https://aka.ms/new-console-template for more information
+using Python.Runtime;
+
+Console.WriteLine("Hello, World!");
+
+var pathToVirtualEnv = @"D:\Dev\VirtualPythonC#\.conda\";
+
+var path = Environment.GetEnvironmentVariable("PATH").TrimEnd(';');
+path = string.IsNullOrEmpty(path) ? pathToVirtualEnv : path + ";" + pathToVirtualEnv;
+Environment.SetEnvironmentVariable("PATH", path, EnvironmentVariableTarget.Process);
+Environment.SetEnvironmentVariable("PATH", pathToVirtualEnv, EnvironmentVariableTarget.Process);
+Environment.SetEnvironmentVariable("PYTHONHOME", pathToVirtualEnv, EnvironmentVariableTarget.Process);
+Environment.SetEnvironmentVariable("PYTHONPATH", $"{pathToVirtualEnv}\\Lib\\site-packages;{pathToVirtualEnv}\\Lib", EnvironmentVariableTarget.Process);
+
+Runtime.PythonDLL = pathToVirtualEnv + @"python311.dll";
+
+PythonEngine.PythonHome = pathToVirtualEnv;
+PythonEngine.PythonPath = Environment.GetEnvironmentVariable("PYTHONPATH", EnvironmentVariableTarget.Process);
+
+PythonEngine.Initialize();
+dynamic sys = Py.Import("sys");
+Console.WriteLine("Python version: " + sys.version);

VirtualPythonC#/VirtualPythonC#.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>VirtualPythonC_</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="pythonnet" Version="3.0.3" />
+  </ItemGroup>
+
+</Project>