Is there any async equivalent of Process.Start?

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Process.Start() only starts the process, it doesn’t wait until it finishes, so it doesn’t make much sense to make it async. If you still want to do it, you can do something like await Task.Run(() => Process.Start(fileName)).

But, if you want to asynchronously wait for the process to finish, you can use the Exited event together with TaskCompletionSource:

static Task<int> RunProcessAsync(string fileName)
{
    var tcs = new TaskCompletionSource<int>();

    var process = new Process
    {
        StartInfo = { FileName = fileName },
        EnableRaisingEvents = true
    };

    process.Exited += (sender, args) =>
    {
        tcs.SetResult(process.ExitCode);
        process.Dispose();
    };

    process.Start();

    return tcs.Task;
}

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