Scheduled reboot

I am creating a windows service that should run every hour, check database for a reboot date and time and schedule reboot based on the datetime it finds in the database.

I can use Windows scheduler to schedule my windows service and I took care of the data retrieval part. Now I am trying to find the best way to schedule a reboot based on the retrieved value.

Should I use the registry HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer? if so, could you give me an example?

or should i use System.Diagnostics.Process.Start("ShutDown", "/r")?

Also before a reboot I want to show the user a messagebox warning.

Can anyone help?
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Paul MacDonaldDirector, Information SystemsCommented:
System.Diagnostics.Process.Start("ShutDown", "/r ")

A message box should pop up to warn the user a scheduled shutdown is taking place.  You can use the /t switch to specify how long before the shutdown takes place.
Possible example command line if I wanted to reboot a system called MyServer1 at 11:00pm today:
schtasks /create /tn "Reboot Once" /tr "shutdown /r /f /t 1 /d p:0:0" /sc once /st 23:00 /s MyServer1

This creates a scheduled task on MyServer1 that runs only one time at 11:00pm (/st) and executes the local shutdown command with a 1 second warning and enters a bogus restart reason (/d p:0:0) so the admin isn't prompted to enter a reason when the reboot is done.
YZlatAuthor Commented:
paulmacd, can you give me some examples?

-tjs, I need examples using .NET
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Paul MacDonaldDirector, Information SystemsCommented:
System.Diagnostics.Process.Start("ShutDown", "/r /t 300 ")

...where the /t 300 tells the system to countdown for 5 minutes (300 seconds) before performing the reboot.

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YZlatAuthor Commented:
But how can I schedule it at a particular date and time?

For instance if the date retrieved from the database is April 1st 11:00am, how can I schedule the reboot at that time?
Paul MacDonaldDirector, Information SystemsCommented:
Ah, that's different altogether.

Try something like this (from
//Create process
System.Diagnostics.Process pProcess = new System.Diagnostics.Process();  

//strCommand is path and file name of command to run
pProcess.StartInfo.FileName = strCommand;  

//strCommandParameters are parameters to pass to program pProcess.StartInfo.Arguments = strCommandParameters;  pProcess.StartInfo.UseShellExecute = false;  

//Set output of program to be written to process output stream pProcess.StartInfo.RedirectStandardOutput = true;    

pProcess.StartInfo.WorkingDirectory = strWorkingDirectory;  

//Start the process

//Get program output
string strOutput = pProcess.StandardOutput.ReadToEnd();  

//Wait for process to finish

... and use the AT command to run the SHUTDOWN /R command
(info on AT command:
Your AT command will look something like this:
at [time] /next:[dayofmonth] cmd /c "shutdown /r"

Note that your strCommand in the code sample above will be "AT" and strCommandParameters will be everything else.  

As a matter of full disclosure, this isn't something I've tested myself.
YZlatAuthor Commented:
paulmacd, I have searched everywhere but cannot find AT command or switch anywhere
YZlatAuthor Commented:
paulmacd, I am working on using

System.Diagnostics.Process.Start("ShutDown", "/r /t 300 ")

as you suggested. I get a message displayed that tells me how much time left till shutdown. How can I add a snooze button to it?
Paul MacDonaldDirector, Information SystemsCommented:
Not as such.  

You could ask the user before you start the shutdown, or you could offer the user the opportunity to cancel the shutdown (shutdown /a).
YZlatAuthor Commented:
Thank you. I am gonna give that a try
YZlatAuthor Commented:
thanks for your help, you pointed me in the right direction
Paul MacDonaldDirector, Information SystemsCommented:
Very happy to help.
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