validation email [duplicate]

This question alrea开发者_StackOverflow社区dy has answers here: Closed 11 years ago.

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.

---

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.

---

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..........

---

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.

---

Read these posts:

• Email Address Validation for ASP.NET
• Is RegEx used by System.Net.Mail.MailAddress

Others:

• Effective Email Address Validation
• Email Address Validation Using Regular Expression