Referring to one class from two others C# .Net?

Question

.NET

Hi, maybe I'm a noob (well, it's understandable, I recently started learning the language), but now I got into an unpleasant situation, when accessing one class from the other two, an error occurs: Process is terminated due to StackOverflowException. , such
Who could help, here is the code example of how I do it:

public class MainClass{
Parametrs par = new Parametrs();
par.hps();

}
public class Dog{
Parametrs p = new Parametrs();

p.start()
}

public class Parametrs{
public int hp;
public void hps(){
hp = hp - 1;
}
public void start(){
Console.WriteLine("Запуск пошёл");
}
}

Answer 1

Read https://metanit.com/sharp/ and how to format the code (there is no style example in the online editor).
Your example is https://dotnetfiddle.net/cxLent
And yes, as already reported in the comments, there is no error here.