Basic custom UserNamePasswordValidator implementation

gistfile1.cs

public class CustomValidator : UserNamePasswordValidator
{
    public override void Validate(string user_name, string password)
    {
        if (string.IsNullOrEmpty(user_name) || string.IsNullOrEmpty(password))
            throw new SecurityTokenException("Username and password required");
        if (!(user_name == "test" && password == "test"))
            throw new SecurityTokenException("Wrong username or password.");

        // Not throwing exceptions indicates
        // Credentials accepted
        Console.WriteLine(string.Format("{0} has authed correct.", user_name));
    }
}