Validate email address in vb.net in windows application

Warning ;. IsMatch emailId. In above code we have user public int ValidateEmailId string emailId function to validate the email id. Imports System. Partial Public Class Form1. Inherits Form. Public Sub New.

End Sub. End If. If emailId. If Not rEMail. IsMatch emailId Then. Return 0. Return 1. Return 2. End Function. End Class. End Namespace. Tags: C , C. Net , VB. Net , Windows Application. About the Author We are the group of people who are expertise in different Microsoft technology like Asp. Get Updates Subscribe to our e-mail newsletter to receive updates.

Share This Post. Anonymous 2 November at Popular Posts. Autocomplete Textbox in Asp. NET Framework? Ask Question. Asked 12 years, 4 months ago. Active 1 year, 11 months ago. Viewed 90k times. I want a function to test that a string is formatted like an email address. What comes built-in with the.

NET framework to do this? Zack Peterson. Zack Peterson Zack Peterson Add a comment. Active Oldest Votes. Dan Herbert Jeff Tucker Jeff Tucker 3, 20 20 silver badges 19 19 bronze badges. Thank you for responding. I'm glad to hear that this has gotten some attention from Microsoft!

But, just to clarify, you're saying that the best practice is to catch an exception as I've done in the function above? I would like to add that it is generally bad practice to catch an exception as a way of validating data. Mainly the reason is performance especialy when performing such validation over large sets of data but in generally it is just considered bad practice. For things as simple as email addresses I would opt for using a RegEx instead.

However, this seems to allow simply "part1 part2" without requiring the top-level domain of ". A long time since I wrote this, but it shouldn't allow part2 to just be a random word, it can either be a dot atom OR a domain literal, and domain literals could just be "part2" but must be enclosed in "[" and "]" in order to be valid.

A dot-atom must have a ". The spec is here: tools. Don't remember for sure, but sounds like something I would do. Show 8 more comments. Zack Peterson Edmundo Edmundo 5 5 bronze badges. That seems definitive. But, I'd still prefer to find such a function built-in and squirreled away somewhere within System.

This fails to take into account many different edge cases with email addresses, the most significant of which is a quoted local part. There are plenty of other non-alphanumeric characters which are valid as well that this regex doesn't allow for. I know it's an MSDN article but it's wrong. I re-wrote address parsing for.

MailAddress to be a lot more robust and take these things into account. See my answer below for more detail. The regex will reject valid addresses that use top-level domains with more than 9 characters, — Paul B. This not work with mail like me. Show 1 more comment. Net VB. Form Design. The Form consists of a TextBox control and a Button. The Button has been assigned Click event handler. You will need to import the following namespace. Imports System. If the Email Address is found invalid an error message is displayed using MessageBox.

IsMatch txtEmail. Trim ;. Show "Invalid Email. Object , e As System. EventArgs Handles btnValidate. If Not isValid Then. End If.