C#: Eject or Undock a Laptop PC

Here is a worth sharing tip from Noah Coad of MSDN blogs. This code is worth to try if you have a mobile computer such as laptop and notebook with a docking station and you want the PC to eject from the station using C# or command line. So instead manually hitting the undock button and removing the PC and put it to sleep, you can compile the C# code to form as EXE and double-click it to eject the laptop from dock station for you.


The code uses DLL import from "cfgmgr32.dll" and the System.Runtime.InteropServices namespace.

using System;
using System.Runtime.InteropServices;

namespace EjectPC
{
 class Program
 {
  [DllImport("cfgmgr32.dll", SetLastError = true)]
  static extern int CM_Request_Eject_PC();

  static void Main(string[] args)
  { CM_Request_Eject_PC(); }
}
}

You can also do the same task from the command line

rundll32 cfgmgr32.dll,CM_Request_Eject_PC

This code was originally posted from Noah Coad's blog.

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