Loop program if user enters wrong input - .net-core

Question

I just started learning C# and while loops are confusing me. Unlike Java, where I can use a while loop to loop a program if a user entered a invalid input, it's not acting the same way in C#.
using System;
namespace first {
class Program {
static void Main(string[] args) {
Console.WriteLine("Hi! What is your name");
string userName = Console.ReadLine();
Console.WriteLine("oh! you are:" + userName);
Console.WriteLine("let play a game");
string answer="Y";
while (answer == "Y") {
Random random = new Random();
int correntNumber = random.Next(1, 2);
int guess = 0;
Console.WriteLine("Guess a number");
while (guess != correntNumber) {
string userGuess = Console.ReadLine();
//validate input method 1
try {
guess = int.Parse(userGuess);
} catch (Exception e) {
Console.WriteLine("Invalid inout", e);
}
//validate input method 2
//if(!int.TryParse(userGuess, out guess)) {
// Console.WriteLine("invalid input");
//}
if (guess != correntNumber) {
Console.WriteLine("try again!");
}
}
Console.WriteLine("Yes! corrector");
Console.WriteLine("Play again?");
//string answer;
answer = Console.ReadLine().ToUpper();
if(answer == "Y") {
continue;
} else if (answer == "N") {
Console.WriteLine("bye");
return;
} else if (answer != "Y" || answer != "N") {
Console.WriteLine("y or n");
answer = Console.ReadLine().ToUpper();
continue;
}
}
}
}
}
When I enter a value other than y or n, the message appears,Console.WriteLine("Y or n only");, but the game restarts while it shouldn't.
I am sorry this is a simple and rather silly question, but I can't pin point where I am going wrong.

Answer 1

the problem is that after printing to the user "y or n only" message you take the input but you don't actually do anything with it
so the loop just restarts regardless of the input , to fix this issue you could replace the last if part with this code
while(answer != 'Y' && answer != 'N'){
Console.WriteLine("y or n only");
answer = Convert.ToChar(Console.ReadLine().ToUpper());
}
if(answer == 'Y')
{
continue;
}
else if(answer == 'N')
{
Console.WriteLine("goodbye");
return;
}
so after you read the first input answer of him for repeating or no you check if it's a valid input or not and if it's not you keep asking him for "y or n only" till he enters "Y" or "N" and then you process this answer for whether it's a "Y" or "N" in the if part