How do I programmatically shutdown the computer?

How do I programmatically shutdown the computer?

• Mikael Olesen

  you cant tell how many seconds are left in the timer. the timer is always active until you disable or stop it. it will keep ticking until you stop it.

  one way would be to create a global variable of your "secondsLeft", set it to the starting number of seconds left, then on the timer tick event, subtract 1 from it then update the label, and finally if secondsLeft is 0 then execute and stop timer

  private int secondsLeft = 3;

  ..

  ..

  //timer tick (interval = 1000)

  if (this.secondsLeft == 0)

  {

  this.theTimer.Stop();

  //execute shutdown

  }

  else

  {

  this.theLabel.Text = "seconds left: " + this.secondsLeft.ToString();

  secondsLeft--;

  }

  
  
  

• Will Merydith

  Alright I tried it and it didn't work, here's my code, I don't know if I did it wrong or what:

  private void ShutdownTimer_Tick(object sender, EventArgs e)

  {

  System.Diagnostics.Process.Start("Shutdown", "-s");

  private int secondsLeft = 3;

  //timer tick (interval = 1000)

  if (this.secondsLeft == 0)

  {

  this.ShutdownTimer.stop();

  //execute shutdown

  }

  else

  {

  this.label2.Text = "seconds left: " + this.secondsLeft.ToString();

  secondsLeft--;

  }

  }

  private void Form1_Load(object sender, EventArgs e)

  {

  label2.Text = ShutdownTimer.Interval.ToString() + " Seconds";

  }

  
  
  

• Pramod

  why would it not help on Windows Server Editions of course it will work, if you have permission to shut down the machine, even if its the local machine.

  you would be better off using the shutdown utility than to P/Invoke as you should avoid using P/Invoke as much as possible as it not only slows down performance but can also defeat the purpose of the .NET Base Class libraries.

  the way of using the shutdown utility is as follows:

  shutdown /m \\computerName /s /t 5

   

  /m specifies the machine name

  /s is to shutdown the machine (/r is to reboot the machine)

  /t is the number of seconds until it starts to shutdown the machine

   

  System.Diagnostics.ProcessStartInfo thePSI = new System.Diagnostics.ProcessStartInfo("shutdown");

  thePSI.Arguments = "/m \\\\computerName /s /t 5";

  System.Diagnostics.Process.Start(thePSI);

   

  I believe this utility is available from Windows 2000 and higher, except for Windows ME

  
  
  

• Chiarigos

  public class ClassName

  {

  private int secondsLeft = 3;

  //...

  //...

  private void ShutdownTimer_Tick(object sender, EventArgs e)

  {

  if (this.secondsLeft == 0)

  {

  this.ShutdownTimer.stop();

  System.Diagnostics.Process.Start("Shutdown", "-s");

  }

  else

  {

  this.label2.Text = "seconds left: " + this.secondsLeft.ToString();

  secondsLeft--;

  }

  }

  private void Form1_Load(object sender, EventArgs e)

  {

  label2.Text = ShutdownTimer.Interval.ToString() + " Seconds";

  this.ShutDownTimer.Start();

  }

  }

  
  
  

• DragonC#

  Well you will have to use the API function InitiateSystemShutdownEx... For a full reference of the function visit http://msdn2.microsoft.com/en-gb/library/aa376874.aspx.. You have many parameters that u can supply.

  If this helped you pls mark as answered

  
  
  

• greenhorn

  ahmedilyas wrote:

  why would it not help on Windows Server Editions of course it will work, if you have permission to shut down the machine, even if its the local machine.

  Sorry Ilyas,

  Actually I have only Windows XP to test it right now. I tried to do the same usig shutdown exe on Windows Server 2000 at my work about 1 year back but there was some issue. May be I'm wrong so if I'm so I beg your pardon! You may be right if you have tested it on Windows Server...

  Best Regards,

  Rizwan Ahmed

  
  
  

• DevilDog74

  Thank u guys for all ur help but how do I make a label's text change according to how many seconds r left in the timer For instance I have a timer and a label, I want the timer to countdown for 3 seconds and the label to countdown like 3, 2, 1 and then the shutdown method activated.
  
  

• Pintoo Khaira

  Wait hold on, I have the timer's interval set to 3000 which is 3 seconds correct My timer is enabled. This is the code that I have so far:

  private void ShutdownTimer_Tick(object sender, EventArgs e)

  {

  System.Diagnostics.Process.Start("Shutdown", "-s");

  }

  private void Form1_Load(object sender, EventArgs e)

  {

  label2.Text = ShutdownTimer.Interval.ToString() + " Seconds";

  }

  Is there anything we can do from here to just set the label to refresh and keep counting down according to how many seconds are left

  
  
  

• amiable

  no worries my friend :-)

  As I said, it depends on a couple of factors:

• does the machine/user have permission to perform the command

• does the OS support the command