How to close an explorer instance via its pid?

Question

C++ / C#

The task says to open explorers with the K key and close all open explorers with the x key. I managed to close them by the name of the program (explorer.exe), but at the same time the system rebooted. By pid it is not possible to close open conductors at all

List ids = new List();
for (int i =0; i<5; i++)
{
Word = Console.ReadLine();
Word_to_2 = StringToBinary(Word);

switch (Word_to_2)
{
case "01001011":
Process p = Process.Start("explorer.exe");
ids.Add(p.Id);
break;
case "01010110":
Console.WriteLine("Введите путь");
Path = Console.ReadLine();
break;
case "01000010":
Console.WriteLine("Введите название файла");
File_name = Console.ReadLine();
FileStream fileStream = File.Create(Path + File_name);
StreamWriter output = new StreamWriter(fileStream);
output.Close();
break;
case "01101110":
File.Delete(Path + File_name);
break;
case "01111000":

foreach (var e in ids)
{
Process pp = Process.GetProcessById(e);
pp.Kill();
}
break;
}
}
}

Answer 1

Process.GetProcessById()

Answer 2

You open explorers as child processes, remember their PIDs, then kill them when necessary. The function, how to get the process by PID, was written above.