Issue with C# CMD output

Question

I am creating a C# app that changes Windows Server edition from Standard Evaluation to Standard. I am trying to get a output of the CMD command, but when the DISM command is completed, it asks you if you want to restart the computer and you need to enter "y" or "n". I tried it doing by passing "echo n | " before the command and by using process.StandardInput.Write, but none of this works. The function works perfectly with other commands that doesn´t require user input. Do you have any idea what am I doing wrong? Thanks

 public static string get_cmd_output(string cmd)
    {
        System.Diagnostics.Process process = new System.Diagnostics.Process();
        process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
        process.StartInfo.FileName = "cmd.exe";
        process.StartInfo.Arguments = "/C echo n |  " + cmd;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.CreateNoWindow = true;
        process.StartInfo.RedirectStandardOutput = true;
        process.Start();
        

        string q = "";
        while (!process.HasExited)
            q += process.StandardOutput.ReadToEnd();
        return q;
    }

get_cmd_output("DISM /Online /Set-Edition:ServerStandard /ProductKey:" + key + " /AcceptEula");

Answer 1

In the docs for DISM, one of the global parameters you can pass is /NoRestart:

/NoRestart

Suppresses reboot. If a reboot is not required, this command does nothing. This option will keep the application from prompting for a restart (or keep it from restarting automatically if the /Quiet option is used).

So it should work if you do this:

get_cmd_output("DISM /Online /Set-Edition:ServerStandard /ProductKey:" + key + " /AcceptEula /NoRestart");