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copied!<p>Try using a <code>List<></code>.</p> <pre><code>class Myclass { static List<string> user_Name = new List<string>{ "admin", "user1", "user2" }; static List<string> user_Password = new List<string>{ "admin", "123", "789" }; public static void Check_Method(string u_name, string u_password) { for (int i = 0; i < user_Name.Length; i++) { if (u_name == user_Name[i] && u_password == user_Password[i]) { MessageBox.Show("login successful"); break; } else { if (i == (user_Name.Length - 1)) MessageBox.Show("Badshow"); } } } public static void add_user(string name, string password) { user_Name.Add(name); user_Password.Add(password); } } </code></pre> <p>Here's a refactored version:</p> <p>Users are contained in a user class.</p> <p>They are <code>IEquatable<></code> which compares their username/passwords (you might want to consider looking into a <code>Guid</code> to keep them unique).</p> <p>Easily add/remove users.</p> <pre><code>public class User : IEquatable<User> { public User(string name, string password) { Name = name; Password = password; } public string Name { get; set; } public string Password { get; set; } public bool Equals(User other) { if (other == null) return false; return other.Name == Name && other.Password == Password; } } public class AuthenticationManager { private List<User> LoggedInUsers = new List<User> { new User("Admin", "admin"), new User ("user1", "123"), new User ("user2", "789") }; public bool Authenticate(string userName, string password) { var user = new User(userName, password); //if the user is in the list it will return false otherwise true. return !LoggedInUsers.Any(u => user.Equals(user)); } public void Login(string name, string password) { LoggedInUsers.Add(new User(name, password)); } public void Logout(string name, string password) { LoggedInUsers.Remove(new User(name, password)); } } </code></pre>

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