Validating email address in asp net

03-Jun-2014 02:18 by 2 Comments

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Mail API to send out messages, you may have run into the fact that when you add an email address to a message, it will sometimes throw an exception if the email doesn’t appear to be valid: This is handy since it’s usually better to fail early rather than wait until you actually go to send the message to learn that the email is invalid.

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If (like me when I first saw this) you AREN’T experienced at Regex, it takes a while to parse. The local string (the part of the email address that comes before the @) can contain any of these characters: is a valid email address. For this reason, for a time I began running any email address against the following regular expression instead: Simple, right? This is often the most I do and, when paired with a confirmation field for the email address on your registration form, can alleviate most problems with user error.

Axiom 1: If you're going to gather information on your users, make sure it's valid information.

If you're going to use FORMs to collect your user's information, it is important that you validate this information.

Assume for the sake of argument that you have a requirement to log some specific information about which email address was invalid, which prevents you from simply wrapping the whole thing in a single try-catch block.

Let’s also assume that we want to keep going if we encounter invalid emails, but we want to stop if we encounter an error actually sending the email.

Now, you might wonder, why didn’t we just do that in the original version?

It would have helped a bit, but it still would have included a bunch of separate try-catch blocks, and none of them would have been able to call continue, so to preserve the behavior we want, we would have had to throw the exceptions back up to the calling code anyway, which then would have had to continue if the exception related to an email address, or throw if the exception was on the Send() call. When designing an API, it’s a good idea to consider how your clients will use the API. Mail API does not provide for this kind of workflow out-of-the-box.The result of sending an email to a badly formatted email address would be the same: it’ll get bounced. If you really want to do checking of email addresses right on the signup page, include a confirmation field so they have to type it twice.If your user enters a bad email address, they won’t get the activation email and they’ll try to register again if they really care about using your site. Enterprising individuals will just copy and paste, but what it comes down to is this: if your user enters a bad email address, you shouldn’t make it more of a problem for yourself than you have to.If you want to validate your user's email you need to check for a few things.The @ symbol, at least one period, at least one character before the @ symbol, at least one after before the period, and at least one after the period.Unfortunately, this is not as straightforward as it seems, since some fields of Mail Message require a call to Add() and others are simply setters.