Is Valid Email
using System.Text.RegularExpressions; public class Base { private static bool isValidEmail(string email) { Regex r = new Regex(@"^([0-9a-zA-Z]([-\.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z][-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$"); if (!string.IsNullOrEmpty(email)) return r.IsMatch(email); else return false; } }