Async process start and wait for it to finish

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“and waiting must be async” – I’m not trying to be funny, but isn’t that a contradiction in terms? However, since you are starting a Process, the Exited event may help:

ProcessStartInfo startInfo = null;
Process process = Process.Start(startInfo);
process.EnableRaisingEvents = true;
process.Exited += delegate {/* clean up*/};

If you want to actually wait (timeout etc), then:

if(process.WaitForExit(timeout)) {
    // user exited
} else {
    // timeout (perhaps process.Kill();)
}

For waiting async, perhaps just use a different thread?

ThreadPool.QueueUserWorkItem(delegate {
    Process process = Process.Start(startInfo);
    if(process.WaitForExit(timeout)) {
        // user exited
    } else {
        // timeout
    }
});

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