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I was looking for a short way to eject USB-devices via C#-code, so I coded a little class myself, yet it simply doesn't work. Since there's no popup that says "Lock success!" I assume that the problem relies within the "LockVolume"-function, but I don't know where. Does anybody see the mistake I made? class USBEject { [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] private static extern IntPtr CreateFile( string lpFileName, uint dwDesiredAccess, uint dwShareMode, IntPtr SecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr hTemplateFile ); [DllImport("kernel32.dll", ExactSpelling = true, SetLastError = true, CharSet = CharSet.Auto)] private static extern bool DeviceIoControl( IntPtr hDevice, uint dwIoControlCode, IntPtr lpInBuffer, uint nInBufferSize, IntPtr lpOutBuffer, uint nOutBufferSize, out uint lpBytesReturned, IntPtr lpOverlapped ); [DllImport("kernel32.dll", ExactSpelling = true, SetLastError = true, CharSet = CharSet.Auto)] private static extern bool DeviceIoControl( IntPtr hDevice, uint dwIoControlCode, byte[] lpInBuffer, uint nInBufferSize, IntPtr lpOutBuffer, uint nOutBufferSize, out uint lpBytesReturned, IntPtr lpOverlapped ); [DllImport("kernel32.dll", SetLastError = true)] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool CloseHandle(IntPtr hObject); private IntPtr handle = IntPtr.Zero; const int GENERIC_READ = 0x80000000; const int GENERIC_WRITE = 0x40000000; const int FILE_SHARE_READ = 0x1; const int FILE_SHARE_WRITE = 0x2; const int FSCTL_LOCK_VOLUME = 0x00090018; const int FSCTL_DISMOUNT_VOLUME = 0x00090020; const int IOCTL_STORAGE_EJECT_MEDIA = 0x2D4808; const int IOCT

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