I want to create user Registration with their email address

Question

I want to create a user REgistration page with email address ( user their gmail address) and want to client side checking that this gmail address exists or not ?? I want to use email Address field using (gmail account) and want to check client side if this gmail already valid and verified or not

Danish Habib · Answer

this is the solution to check that your email exists on gmail or not TcpClient tClient = new TcpClient(gmail-smtp-in.l.google.com 25); string CRLF = 
; byte[] dataBuffer; string ResponseString; NetworkStream netStream = tClient.GetStream(); StreamReader reader = new StreamReader(netStream); ResponseString = reader.ReadLine(); /* Perform HELO to SMTP Server and get Response */ dataBuffer = BytesFromString(HELO KirtanHere + CRLF); netStream.Write(dataBuffer 0 dataBuffer.Length); ResponseString = reader.ReadLine(); dataBuffer = BytesFromString(MAIL FROM:  + CRLF); netStream.Write(dataBuffer 0 dataBuffer.Length); ResponseString = reader.ReadLine(); /* Read Response of the RCPT TO Message to know from google if it exist or not */ dataBuffer = BytesFromString(RCPT TO:  + CRLF); netStream.Write(dataBuffer 0 dataBuffer.Length); ResponseString = reader.ReadLine(); if (GetResponseCode(ResponseString) == 550) { Response.Write(Mai Address Does not Exist ! ); Response.Write( Original Error from Smtp Server :  + ResponseString); return false; }

Danish Habib · Answer

Nilesh Jadav  Thanks for contineous reponses and prompt responses The second example shared by you is still using the same techniques in this case it is in the user hand to use a@gmail.com or b@gmail.com  I want when the user input a@gmail.com the system should check that a@gmail.com is actually existing in gmail server or not using SMTP or POP3

Nilesh Jadav · Answer

Hey Danish ! Ok here is the link I think this will work ! http://www.aspdotnet-pools.com/2014/12/validation-of-duplicate-email-id-of.html

Danish Habib · Answer

Hi Nilesh Jadav Thanks for prompt Response My Question is not like that Listen Now I have a User Registration Form Through which user have to sign up the Fiels are (useridNameEmailPassword) I want to prevent the user from input email other than their gmail Already existed account like Dansih.habib@gmail.com if this does not exists in real then the the system should send them a message  my question is integrating gmail email address as your email is User Registration Form

Nilesh Jadav · Answer

Hey there ! Check these link : http://www.aspsnippets.com/Articles/Simple-User-Registration-Form-Example-in-ASPNet.aspx http://www.webcodeexpert.com/2013/08/create-registration-form-and-send.html http://www.webreference.com/programming/asp_net/registration-confirmation-system/index.html