C# question about: Do...While Loops (on Unity)

1. Why does MyInt being increased above 1 whereas the while condition is false?

public class HelloStackoverflow : MonoBehaviour {    int myInt = 0;    public bool myBool = false;     void Update () {        print(myInt);        do{            myInt++;        }while(myBool == true);    }}

-> I expected myInt to reach 1 and not more cause myBool is never set to true. I understood that the Do part of a Do...While is being executed at least once before the condition is being checked, to see if it should loop or not.

2. Then, why do the same code crashes when I set myBool to true from the Inspector?-> whereas I thought myInt would have reached 1 (Q1) and then would go further once (and not before) myBool was set to true from the Inspector.

3. Why do I feel so dumb just with this Do...While basic?

please excuse my english