validation email

Question

Possible Duplicate:
Email Address Validation for ASP.NET

 <input id="txtemail" type="text" />

 private void btnDelete_Click(object sender, EventArgs e)
 {
     //txtemail check is email or not
 }

how can check that content txtemail is email.

How about ASP.NET RegularExpression Validation control? – KV Prajapati Mar 16 '11 at 06:22 — KV Prajapati, Mar 16 '11 at 06:22

Oleks · Answer 1 · 2013-12-06T17:35:26.477

6

Why don't you just use build-in System.Net.Mail.MailAddress class for email validation?

private void btnDelete_Click(object sender, EventArgs e)
{
    bool isValidEmail = false;
    try
    {
        var email = new MailAddress(txtEmail.Text);
        isValidEmail = true;
    {
    catch
    {
    }
}

Note: as mentioned in the comments, it might give unexpected results. A mail address here is composed of a User name, Host name and optionally, a DisplayName. So, in this case you could additionaly verify the DisplayName, and if it is not empty also return false.

edited Dec 06 '13 at 17:35

answered Mar 16 '11 at 08:19

Oleks

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This might give unexpected results. For instance, given the string john doe@mail.com, this is considered to be valid email. Where doe@mail.com is the email and john the display name. – coffeeyesplease Dec 06 '13 at 16:51
@coffeeyesplease: thank you, it is fair enough :) I updated my answer. – Oleks Dec 06 '13 at 17:36

score 1 · Answer 2 · answered Mar 16 '11 at 06:34

in c#

take regular expresion validator and set its poperty "VALIDATION EXPRESION" via go in property window.

and put expesion is follow.

^([a-zA-Z0-9_-.]+)@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.)|(([a-zA-Z0-9-]+.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(]?)$

try this..........

score 0 · Answer 3 · answered Mar 16 '11 at 06:22

Your best bet is to use a email validating regex to verify that the txtemail.text is a valid email. A word of caution though, if you are going to do this make sure to implement a robust solution as nothing chokes users more than when they enter a valid email and have the page reject it.

score -1 · Accepted Answer · edited May 23 '17 at 11:47

-1

Read these posts:

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edited May 23 '17 at 11:47

Community

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answered Mar 16 '11 at 06:21

Naveed

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This incorrectly classifies emails with plus signs in them as invalid. There's also probably some other flaws, too. – icktoofay Mar 16 '11 at 08:27

validation email

4 Answers4