process.kill in asp.net is access denied

In the following code, this is my excel process kill for clearing memory after use by asp.net. It has worked before I change my IP address, after that there're some error about "System.ComponentModel.Win32Exception: Access is denied" at proc.Kill(). When I change my IP to the old one, it work, but I have to using new IP. So please give me some idea about this.
For Each proc As Process In Process.GetProcessesByName("EXCEL")
     proc.Kill()
 Next

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KrichayaEAsked:
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ppittleCommented:
From the Process.Kill documentation http://msdn.microsoft.com/en-us/library/system.diagnostics.process.kill(VS.80).aspx:

If the call to the Kill method is made while the process is currently terminating, a Win32Exception is thrown for Access Denied.

Try using proc.WaitForExit() http://msdn.microsoft.com/en-us/library/ty0d8k56(VS.80).aspx.  This does a synchronus close, meaning your program will halt execution until the Excel process has closed.  The Kill method is aynschronus, meaning that your code will not wait for Excel to close.  If the Kill method is called for the same process more than once, an Exception will be thrown.

Also, the Execution Context at the time when proc.Kill or proc.WatForExit() executes needs to have full trust permission.  One way to do this is with WindowsImpersonationContext:

using (WindowsImpersonationContext impCtx = (HttpContext.Current.User.Identity as WindowsIdentity).Impersonate())
{
  //Kill process code
 
  impCtx.Undo();
}

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KrichayaEAuthor Commented:
I found my jerky cause, it come from Excel File opening from outside asp.net. So "Process.GetProcessesByName("EXCEL")" is include my Excel File into process and surely that it will access denied.

In the other way, I try to using "proc.WaitForExit()" like ppittle suggest. It will waiting until timeout if I not closing this Excel File.

So I have an idea that "Process.GetProcessesByName("EXCEL")" should get process by user name but I don't know how to. Are there any way that "Process.GetProcessesByName("EXCEL")" will check process from user "ASPNET" only ?
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ppittleCommented:
Give this a try:

//Iterate through all Excel processes on local machine
foreach (Process proc in Process.GetP{rocessesByName("EXCEL"))
{
   //Only work with Processes started by ASPNET
   if (proc.StartInfo.UserName.Equals("ASPNET", StringComparison.InvariantCultureIgnoreCase))
   {
            //Impersonate a user that has permissions to kill the process
            using (WindowsImpersonationContext impCtx = (HttpContext.Current.User.Identity as    WindowsIdentity).Impersonate())
{
  //Kill process code
 
  impCtx.Undo();
}

    }
}
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KrichayaEAuthor Commented:
Yah! It work. Thanks a million, ppittle.
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ppittleCommented:
I'm glad to hear the solution worked for you.  Happy coding!
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