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Editorial Team
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Asked: 2026-05-22T18:38:24+00:00

ProcessStartInfo psi = new ProcessStartInfo(BatchFile) Process p = Process.Start(psi) Why p.ID is different than

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ProcessStartInfo psi = new ProcessStartInfo(BatchFile)

Process p = Process.Start(psi)

Why p.ID is different than process id visible in WindowsTaskManager

(BatchFile is path to external program with appropriate parameters)

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1 Answer

  1. Editorial Team

    A process ID is only meaningful while the process is alive. The first thing to check is .HasExited – if this is true, ignore the process ID; it no longer has any meaning.

    There are a number of ways you can start something and have no process left even though you can apparently see it still on screen:

    • if it is a script/bat/cmd that spawns something and exits (remember: you are watching the script, not the “something”)
    • if the exe does some inter-exe voodoo internally – for example, most of the office apps and internet explorer do this; if there is an existing process, it forwards the args to that process to handle, and exits immediately
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