ITimeU.Controllers.AthleteController.IsValidInput C# (CSharp) Method

        public bool IsValidInput(string firstname, string lastname, string email, string startnumber, string clubId = "1")
        {
            int startnum = 0;
            if (String.IsNullOrEmpty(firstname) || String.IsNullOrEmpty(lastname) || String.IsNullOrEmpty(clubId)
                || String.IsNullOrEmpty(email) || String.IsNullOrEmpty(startnumber) || (!isValidEmail(email))
                || (!int.TryParse(startnumber, out startnum)))
            {
                return false;
            }
            else
            {
                return true;
            }
        }