csharp:Validate email address using C#

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/// <summary>    ///    /// </summary>    /// <param name="email"></param>    /// <returns></returns>    public bool IsValidEmail(string email)    {        try        {            var addr = new System.Net.Mail.MailAddress(email);            return addr.Address == email;        }        catch        {            return false;        }    }    /// <summary>    /// using System.ComponentModel.DataAnnotations; 4.5 over  涂聚文(Geovin Du)标注    /// </summary>    /// <param name="source"></param>    /// <returns></returns>    public bool IsValidEmailDu(string source)    {        //https://referencesource.microsoft.com/#System.ComponentModel.DataAnnotations/DataAnnotations/EmailAddressAttribute.cs,54        return new EmailAddressAttribute().IsValid(source);    }        static Regex ValidEmailRegex = CreateValidEmailRegex();      /// <summary>    /// Taken from http://haacked.com/archive/2007/08/21/i-knew-how-to-validate-an-email-address-until-i.aspx    /// </summary>    /// <returns></returns>    private static Regex CreateValidEmailRegex()    {        string validEmailPattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|"            + @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)"            + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";          return new Regex(validEmailPattern, RegexOptions.IgnoreCase);    }      internal  bool EmailIsValid(string emailAddress)    {        bool isValid = ValidEmailRegex.IsMatch(emailAddress);          return isValid;    }    /// <summary>    ///    /// </summary>    /// <param name="email"></param>    /// <returns></returns>    public  bool EmailIsValidGeovin(string email)    {        string expression = "\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*";          if (Regex.IsMatch(email, expression))        {            if (Regex.Replace(email, expression, string.Empty).Length == 0)            {                return true;            }        }        return false;    }    /// <summary>    ///    /// </summary>    /// <param name="email"></param>    /// <returns></returns>    public static bool IsValidEmailTu(this string email)    {        string pattern = @"^(?!\.)(""([^""\r\\]|\\[""\r\\])*""|" + @"([-a-z0-9!#$%&'*+/=?^_`{|}~]|(?<!\.)\.)*)(?<!\.)" + @"@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$";        var regex = new Regex(pattern, RegexOptions.IgnoreCase);        return regex.IsMatch(email);    }    /// <summary>    ///    /// </summary>    /// <param name="emailAddress"></param>    /// <returns></returns>    public static bool IsValidEmailAddress(string emailAddress)    {        bool MethodResult = false;          try        {            System.Net.Mail.MailAddress m = new System.Net.Mail.MailAddress(emailAddress);              MethodResult = m.Address == emailAddress;          }        catch //(Exception ex)        {            //ex.HandleException();https://stackoverflow.com/questions/1365407/c-sharp-code-to-validate-email-address          }          return MethodResult;      }    /// <summary>    ///    /// </summary>    /// <param name="InputEmail"></param>    /// <returns></returns>    public static bool IsValidEmailId(string InputEmail)    {        Regex regex = new Regex(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");        Match match = regex.Match(InputEmail);        if (match.Success)            return true;        else            return false;    }    /// <summary>    ///    /// </summary>    /// <param name="emailAddress"></param>    /// <returns></returns>    public bool ValidateEmail(string emailAddress)    {        string regexPattern = @"^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$";        Match matches = Regex.Match(emailAddress, regexPattern);        return matches.Success;    }