Validierung einer E-Mail

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    /// <summary>
    /// Determines whether the specified email address is in a valid format (RFC 822).
    /// </summary>
    /// <param name="MailAddress">Email address to validate.</param>
    /// <returns><c>True</c> if the email address is formatted correctly, otherwise <c>False</c>.</returns>
    /// <remarks></remarks>
    public static bool IsMailAddress(String MailAddress)
    {
      return Regex.IsMatch(MailAddress, @"[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?");
    }