//CONSTRAINT FOR THE PASSWORD IF ALREADY EXISTS
public static string PasswordCheck(string passWord, School school)
{
passWord = SHA.GenerateSHA512String(passWord);
while (String.IsNullOrEmpty(passWord) || school.Users.Exists(u => u.PassWord == passWord))
{
Console.WriteLine("This password already exists,try another");
passWord = SHA.GenerateSHA512String(Console.ReadLine());
}
return(passWord);
}
//CONSTRAINT FOR THE USERNAME IF ALREADY EXISTS
public static string UsernameCheck(string userName, School school)
{
userName = SHA.GenerateSHA512String(userName);
while (String.IsNullOrEmpty(userName) || school.Users.Exists(u => u.UserName == userName))
{
Console.WriteLine("This username already exists,try another");
userName = SHA.GenerateSHA512String(Console.ReadLine());
}
return(userName);
}
