public Boolean CheckCorrectUser(LoginData loginData)
        {
            //Check if correct admin
            if (loginData.username == AdminCredentials.Username &&
                Crypto.VerifyHashedPassword(Crypto.HashPassword(Crypto.SHA256(AdminCredentials.Password)), loginData.password)
                )
            {
                return(true);
            }

            //Check if user was found
            fv_users finalUser = null;

            try
            {
                finalUser = fv_users.Single(m => m.u_name == loginData.username);
            }
            catch (InvalidOperationException) { }
            if (finalUser == null)
            {
                return(false);
            }

            //Check if password is right
            if (Crypto.VerifyHashedPassword(finalUser.u_password, loginData.password))
            {
                //Check if username is not blocked
                if (finalUser.u_isLocked == 0)
                {
                    return(true);
                }
            }

            return(false);
        }
        public string GetFirstNameForUsername(string username)
        {
            if (UserIsAdmin(username))
            {
                return("Administrator");
            }

            //Check if user was found
            fv_users finalUser = null;

            try
            {
                finalUser = fv_users.Single(m => m.u_name == username);
            }
            catch (InvalidOperationException) { }
            if (finalUser == null)
            {
                return("[undefined]");
            }

            return(finalUser.u_firstName);
        }