รบกวนถามเรื่อง Do while , while ในการถามซ้ำว่าจะทำอีกรอบหรือไม่ รบกวนทีครับ

using System;

namespace Novice

{

class Appleza

{

static void Main()

{

string Fname, Lname;

char respones;

int salary, vat = 0;


do

{

Console.Write("Input your Fname: ");

Fname = Console.ReadLine();

Console.Write("Input your Lname: ");

Lname = Console.ReadLine();

Console.Write("Input your salary: ");

salary = int.Parse(Console.ReadLine());

vat = salary * 7 / 100;


Console.WriteLine("Your firstname is {0} your lastname is {1} and your vat is {2}", Fname, Lname, vat);

Console.Write("Do you want to do again??");

respones = GetChar();

while(respones == 'Y') 


} while (salary >= 0);

Console.Write("BYE BYE!!!!");

Console.ReadLine();

}

}


public static char GetChar()

{

string inputString;

char answer;

inputString = Console.ReadLine();

answer = Convert.ToChar(inputString);

return answer;

}

}

}