using System;

public class Program

{

    public static void Main()

    {

        string UserName  = "";

        string UserPassword = "";

        bool ValidUserNameFlag = false;

        bool ValidUserPasswordFlag = false;

        bool ValidCredentials = false;

        int userToCheck = 0;

        string[] ValidUserNames =  new string[]  {"user", "Bob", "Jane"};

        string[] ValidUserPassWords =  new string[]{"user", "2345", "^&*("};

        do

        {

            Console.WriteLine("User Name or Email");

            UserName = Console.ReadLine();

            Console.WriteLine("Password");

            UserPassword = Console.ReadLine();  

        if(UserName == ValidUserNames[userToCheck])

        {

            ValidUserNameFlag = true;

        }

        if(UserPassword == ValidUserPassWords[userToCheck])

        {

            ValidUserPasswordFlag = true;

        }

        if(ValidUserNameFlag == true && ValidUserPasswordFlag == true )

        {

            ValidCredentials = true;

            break;

        }

        else

        {

            Console.WriteLine("Invalid Credentials");

        }   

        userToCheck++;

        Console.WriteLine("eachUser = " + userToCheck);

    }while(userToCheck < ValidUserNames.Length);

    if(ValidCredentials == false)

    {

        Console.WriteLine("Invalid Credentials");

    }while(ValidCredentials);

     Console.WriteLine("Login Successful");

        }

}