Comments by Rao Lokesh (Top 15 by date)

http://stackoverflow.com/questions/866239/creating-the-checkbox-dynamically-using-javascript

Process.Start(Application.StartupPath & "Excel.xls")

Write you image path in place of Excel and check

Have you tried Application.StartupPath

http://verify-email.org/
Check 3nikhilsagar77@yahoo.com at this web site

Yes I m 100 % sure this email is not valid . emails get bounced if i send to this email , that is the thing my tool is also showing it verified but in reality it is not . some of the tool on internet tell correctly that it is a invalid email

MY Complete Code


using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Mail;
using System.Net.Sockets;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Heijden.DNS;
using System.IO;
using System.Data;
using System.Data.SqlClient;


namespace EmailValidation_Library
{
public enum ValidationMode
{
Syntax,
Network
};

public class EmailValidator : IDisposable
{
public string MailFrom { get; set; }

public string GetLastError { private set; get; }

public string ValidateEmail(string strInputEmail)
{
//string strAcceptableEmailAddressPattern = @"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
// @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
// @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$";
//Regex regPatternEmail = new Regex(strAcceptableEmailAddressPattern);


//case ValidationMode.Syntax:
// try
// {
// return (regPatternEmail.IsMatch(strInputEmail));
// }
// catch (Exception RegExPatternException)
// {
// GetLastError = string.Format("Could not match pattern because of the error {0} ",RegExPatternException.Message);
// return (false);
// }
//case ValidationMode.Network:
string strHostName = string.Empty;
try
{
string[] arrHost = strInputEmail.Split('@');
strHostName = arrHost[1];
}
catch (Exception HostMalformedException)
{
GetLastError = string.Format("Could not identify the target email server because of the error {0} ", HostMalformedException.Message);
}

try
{
Resolver objResolver = new Resolver();
Response objResponse = objResolver.Query(strHostName, QType.MX, QClass.IN);

bool blnValidAddress = false;

if (objResponse.RecordsMX.Length < 1)
{
return ("Host Name Not Found ");
}
else
{
foreach (RecordMX recMx in objResponse.RecordsMX)
{
//blnValidAddress = VerifySmtpResponse(recMx.EXCHANGE, strInputEmail);
//if (blnValidAddress)
// break;

//TcpClient tClient = new TcpClient(recMx.EXCHANGE, 25);
TcpClient tClient = new TcpClient(recMx.EXCHANGE, 995);
//TcpClient tClient = new TcpClient( );
//tClient.Connect("www.yahoo.com", 25);
string CRLF = "\r\n";
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 Here" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
string str = strInputEmail;
dataBuffer = BytesFromString("MAIL FROM:<" + str + ">" + 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:<" + strInputEmail.Trim() + ">" + CRLF);

"VRFY" AND EXPN is also not working ,


Problem is they are giving 250 OK response. But in reality that email doesn't exist
For Example "3nikhilsagar77@yahoo.com" It Is Not a valid email but 250 response come when I check

I Have To check whether an email really exists or not. my code is running fine for all other mail clients except yahoo.

I read response code from reader if code is 250 then email is verified but in case of yahoo ,it always give 250 code

Mark As Answer If You Get Answer

double a = 2.333333;
System.Math.Round(a)

After This U Can Convert It Into Format You Want