user input and password

Hello,

It doesn't work because the scope of your variables is incorrect you need to put them above the do keyword, like this.

string username, pass;
 
            do
            {
                Console.Write("Enter a username:  ");
                username =Console.ReadLine();

                Console.Write("Enter a password:  ");
                pass = Console.ReadLine();

                if (username =="john"&& pass=="mjamaa")
                    Console.WriteLine("Login Error");

            }
            while (username =="john"&& pass=="mjamaa");
           
            Console.WriteLine("Login successful");

You have another logical mistake but I'll leave it to you.

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Regards,



Eyal Shilony