Disable Fast Startup (C#)

// SetDisableFastStartup.cs
//
// Disable Fast Startup.
// Disables Fast Startup, useful when dual-booting or troubleshooting shutdowns (requires admin). Requires an elevated (Administrator) prompt.
//
// Usage: dotnet new console -o SetDisableFastStartup, replace Program.cs with this
// file, then dotnet run.

using System;
using Microsoft.Win32;

using RegistryKey key = Registry.LocalMachine.CreateSubKey(@"SYSTEM\CurrentControlSet\Control\Session Manager\Power");
key.SetValue("HiberbootEnabled", 0, RegistryValueKind.DWord);

Console.WriteLine("Disable Fast Startup applied.");