Email-Validation using C#.net

Question

 

Hi Friends,

 

               How to validate an Such an Email-id : [e-mail] [One of my customer having such an mail-id]

               Im validating using regular expression  in C#.net:

                

              

string pattern = @"^[a-z][a-z|0-9|]*([_][a-z|0-9]+)*([.][a-z|" +

@"0-9]+([_][a-z|0-9]+)*)?@[a-z][a-z|0-9|]*([-][a-z|0-9]+)*\.([a-z]" +

@"[a-z|0-9]*(\.[a-z][a-z|0-9]*)?)$";

 

 

System.Text.RegularExpressions.Match match = System.Text.RegularExpressions.Regex.Match(editemail.Text.Trim(), pattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase);

if (!match.Success)

{

MessageBox.Show("You must specify valid E-mail", this.vGlobalVariables.gProductVersion, MessageBoxButtons.OK, MessageBoxIcon.Warning);

this.editemail.Focus();

}

 

While using the above code its saying You must specify valid email.

How to validate the above email-id [[e-mail]]?

 

 

Thanks

Divakar

 

 

Answer 1

Send an email to the address and have the user click a link to verify ownership of the email.

Answer 2

 

use

Code Snippet

string pattern = @"[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|].[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]@test-med.com";

 

 

if the address will terminate in @test-med.com

 

or

Code Snippet

 

string pattern2 = @"[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|].[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]@[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|].[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|]-[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|].[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|].com";

 

 

if the address will be something like ***-***@***-***.com

 

 

i hope you got my point.

Answer 3

Thanks for ur valuable code...

 

Thanks

Divakar

 

Answer 4

 

glad i could be of help

Answer 5

 

You may find it useful to understand the logic behind the regex.

 

http://www.regular-expressions.info/email.html

 

Answer 6

hi,


               This is good sample


regards,
ramesh.v 

Answer 7

hi,


      I would like to validate domain ID given in the txt_email (Textbox), if the valid domain id is given, i will let the user to submit the form otherwise not...

can anyone help me asap, thanks in advance.

This is my code:-

public static bool IsDomainExistence(string strEmailID)
{
try
{
string[] host = (strEmailID.Split('@'));
string hostname = host[1];

IPHostEntry IPhst = Dns.GetHostEntry(hostname);
IPEndPoint endPt = new IPEndPoint(IPhst.AddressList[0], 25);
Socket s = new Socket(endPt.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
s.Connect(endPt);
}
catch (Exception)
{
return false;
}
return true;
}


It works fine in local, but when it is uploaded to server, it produces error message, even-if our domain id is given.


regards,
Balamurugan

Answer 8

Original posting --> Wednesday, April 30, 2008 1:39 PM

---

John Grove - TFD Group, Senior Software Engineer, EI Division, http://www.tfdg.com

Answer 9

I have found this one NetXtreme Email Verifier Component . It is good for me, hope this helps you.

Answer 10

Hi all,

in my company we use EmailVerify.NET (http://www.emailverify.net), a Microsoft .NET component which supports e-mail syntax checking, domain MX test and mailbox validation too.
E-mail validation up to the mailbox level is easy as writing the following code block:

var verifier = new EmailVerifier();
var result = verifier.Verify("[e-mail]", VerificationLevel.Mailbox);

if (result.IsSuccess)
{
   // Go on, send the message
}

Additional code samples can be found here.
From their home page:

EmailVerify.NET is a powerful .NET component which verifies email addresses using various techniques, including:

• Syntax verification, according to RFC 2821 and RFC 2822
• MX record lookup
• Disposable email address (DEA) validation
• SMTP availability check
• Mailbox existence check, with greylisting support
• Catch-all test

It is completely written in managed code (C#) and is compliant with the Common Language Specification (CLS), so it can be used with any other .NET language, including VB.NET, C++/CLI, J#, IronPython, IronRuby and F#.

The price for this component is very small (less than 50 bucks) and their support is one of the greatest I've ever found for a small software company like they are.
Hope this helps.