Sending email with unique link and parameters using asp.net

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Requirement : For forgot password functionality, need to send email contains unique and one time use link to reset password.
I am able to send email with unique link created using GUID functionality. Now I want to make it one time use. How to do that?

What I have tried:

C#

protected void btnRECOVER_PASSWORD_Click(object sender, EventArgs e)
       {
           SendMail();
       }

C#

public void SendMail()
       {

           login = new NetworkCredential("leaves@nworks.co", "password");
           client = new SmtpClient("smtp.1and1.com");
           client.Port = Convert.ToInt32(25);
           client.EnableSsl = true;
           client.Credentials = login;
           msg = new MailMessage { From = new MailAddress("leaves@nworks.co", "nWorks Employee", Encoding.UTF8) };
           msg.To.Add(new MailAddress(this.TextBoxEmail_Mobile.Text));
           msg.Subject = "Recover Password For Your nWorks Leave Management Account";
           msg.CC.Add(new MailAddress("dipak.a.akhade9192@gmail.com"));
           //       msg.CC.Add(new MailAddress("*************user mail id*************"));
           string strBody = string.Empty;
           Guid code = Guid.NewGuid();

               strBody += "<html><head></head><body><p>Click the following link to recover your password.</p>";
               strBody += Environment.NewLine;


               strBody += "<form action='' method='POST' name='myForm1'><a href='http://localhost:19343/ResetPasswordForm.aspx'>'" + code.ToString() + "'</form><br>";


           strBody += "<br/>Thanks.</body></html>";

           msg.Body = strBody;

           msg.BodyEncoding = Encoding.UTF8;
           msg.IsBodyHtml = true;
           msg.Priority = MailPriority.Normal;
           msg.DeliveryNotificationOptions = DeliveryNotificationOptions.OnFailure;
           client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
           string userstate = "sending.......";
           client.SendAsync(msg, userstate);

           string q1 = "insert into RecoverPwdStatus values(101,'" + code.ToString() + "');";
           MySqlCommand cmd1 = new MySqlCommand(q1, conn); conn.Open();
           MySqlDataReader rdr1 = cmd1.ExecuteReader(); conn.Close();

       }

Posted 14-Feb-16 18:04pm

Member 11914978

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Member 11914978 15-Feb-16 0:11am

I am thinking to save that unique link in database across the user while sending email to him with the same link. As user clicks link for first time delete that link from database. If that link is not available in database and user wants to use it,redirect him to error page. But I don't know how to detect that link and user when someone clicks that link.

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2016-02-14T20:03:00

Solution 1

Quote:
As user clicks link for first time delete that link from database.

To the href append that code. So, the url should look like...

http://localhost:19343/ResetPasswordForm.aspx?code=12345

Now when user clicks on this link, the page load event is fired. Inside page load retrieve the QueryString "code". Do whatever you want to do after that.

Posted 14-Feb-16 20:03pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Updated 14-Feb-16 20:04pm

v2

Comments

Member 11914978 15-Feb-16 2:14am

Thanks... I am trying same solution... but I want more than
two parameters... then what to do?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 15-Feb-16 2:22am

http://localhost:19343/ResetPasswordForm.aspx?code=12345&secondParam=6789

Member 11914978 15-Feb-16 3:30am

But sir I have ResetPasswordForm.aspx page in my project.... if I am using http://localhost:19343/ResetPasswordForm.aspx?code=12345&secondParam=6789.... page not found error occurs.

Member 11914978 15-Feb-16 4:08am

I used :

Member 11914978 15-Feb-16 3:28am

But sir I have ResetPasswordForm.aspx page in my project.... if I am using http://localhost:19343/ResetPasswordForm.aspx?code=12345&secondParam=6789.... page not found error occurs.

Member 11914978 15-Feb-16 4:17am

Thanks... Worked fine....

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 15-Feb-16 4:48am

Cool. :)

Member 11914978 15-Feb-16 5:01am

When I used strBody += "<html><head></head><body><p>Click the following link to recover your password.</p>";
strBody += Environment.NewLine;

strBody += "<form action='' method='POST' name='myForm1'>Reset Password</form><br>";

strBody += "<br/>Thanks.</body></html>";

Unable to get paramater name and its value too.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 15-Feb-16 5:42am

Which line exactly throws this exception?

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 15-Feb-16 6:13am

Where exactly you see this issue? Line of code?

Member 11914978 15-Feb-16 5:44am

This line coming as url :
http://localhost:19343/ResetPasswordForm.aspx?guid=
that is not accepting variables values.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 15-Feb-16 6:14am

That means it is not appending the Guid. Debug and see the problem.