How to Shut Down a Windows Computer Using C#?

Using C# to Power Down Your Windows Computer

Several methods exist for shutting down a Windows computer from a C# application. The most efficient and integrated .NET solution involves using Process.Start with the shutdown command.

For Windows XP and later, a simple command suffices:

<code class="language-csharp">Process.Start("shutdown", "/s /t 0");</code>

This immediately initiates a system shutdown (0 seconds timeout).

For controlled shutdowns, adjust the /t parameter to specify the desired delay in seconds:

<code class="language-csharp">Process.Start("shutdown", "/s /t 120"); // Shuts down after 120 seconds</code>

To avoid displaying a separate shutdown window, utilize this refined code:

<code class="language-csharp">var psi = new ProcessStartInfo("shutdown", "/s /t 0");
psi.CreateNoWindow = true;
psi.UseShellExecute = false;
Process.Start(psi);</code>

This ensures a clean, windowless shutdown.

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