how to email verification in c#?

Abhilash J A

9y916.NET

Hello everyone,

I am working on MVC 5, I want to verify Email ID.

1) I am now validating email addres using jquery.

function isEmail(email) {
var regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
return regex.test(email);
}

2) And checking the email id is existing or not inside database.

[HttpPost]
public bool UserEmailIDExist(string emailid)
{
if (IsValidEmail(emailid) == true)
{
PartnerBIL partnerBIL = new PartnerBIL();
return partnerBIL.SearchCompanyname(emailid);
}
else {
return true;
}
}
public bool IsValidEmail(string email)
{
/*Here, Which code I use for validate email id?*/
}

Also I want to verify the email id is valid online, how can I do that?

Please help me...

9 Replies

Know the answer? Post it — somebody with the same question will find it here.

Nitin Sontakke9y ago
Accepted answer
@Abhilash, your only option is send the mail. Otherwise it is difficult.

I am adding response layer to it because anybody can put anybody else's email address.
Rafnas T P9y ago
hi @abhilash,
as I said you can send mail to that email id and you can validate that
Joginder Banger9y ago
are u sure @Rafnas T P that is @Abhilash Jayakumar need???
Rafnas T P9y ago
if you wanted to validate whether the email address is existing or what in online
than you have send one mail to that mail address if it success than that is valid
see here an example
https://www.codeproject.com/Tips/738090/ASP-NET-MVC-Confirm-Registration-Email
Abhilash J A9y ago
Hello Nitin Sir,

Excuse me! I just want validate emailid...

For example, If the user entered the email id like '[email protected]' then want to verity this is actual or not like that...

Thanks for reply me...
Abhilash
Joginder Banger9y ago
as per your code or way of asking question you want validate email online, that is not possible.
Nitin Sontakke9y ago
I don't think there is any other way than to send a mail to that mail address and then ask a reply back.

Asking a reply back is important because it is easy for me to enter your email address.

Then you will need to have hyperlink in the email and add some random number to it in the url as a query string parameter:
&rd=146A42D7-6EF1-46F0-BEDC-61E7AB360809

This number you store in db also. When that user clicks on that url you get the value in response. Compare that witht he value in db. If it matches you know that user has access to the email address s/he has entered and you have successfully validated it.

By the way, number I used is a GUId. You can create it easily either in C# or SQL Server.
Abhilash J A9y ago
Hello Nitin Sir,

I can validate the email id formate through jquery. But I want verify email id online. How can I do that?

Thanks,
Abhilash
Nitin Sontakke9y ago
What do you mean by "validate"? Do you want to check if mail id exists by sending a mail? Or do you want to see if it is in correct format?

If you want to check format is correct, just google and really loads of regular expression formulas to check validity.