public static void Main()
string[] ValidUserNames = new string[]{"admin","Joe","Jane"};
string[] ValidPasswords = new string[]{"pass","1234","!@#$"};
bool ValidCredentialsFlag = false;
Console.WriteLine("User Name: "); UserName = Console.ReadLine();
Console.WriteLine("Password: "); Password = Console.ReadLine();
ValidCredentialsFlag = CredentialValidationCheck(UserName, Password, ValidUserNames[userToCheck],ValidPasswords[userToCheck]);
}while(userToCheck < ValidUserNames.Length && ValidCredentialsFlag == false);
if(ValidCredentialsFlag == false) Console.WriteLine("Invalid Login Credentials");
}while(ValidCredentialsFlag == false);
Console.WriteLine("Successful Login");
public static bool CredentialValidationCheck(string userNameToCheck, string passWordToCheck, string validUserName, string validPassword)
if(userNameToCheck == validUserName && passWordToCheck == validPassword)