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      Validating e-mail addresses using multiple threads

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      Validating e-mail addresses using multiple threads

      This version of UltimateEmailValidator offers an easy way to verify email addresses using multiple threads. You can use multiple threads to verify email addresses in a Text File, DataTable, DataSet, IDataReader or IList by specifying the number of threads will be used in parameter threads of corresponding MultiThreadsValidateEmails method.

      The steps below illustrate how to create a window application to verify email addresses using multiple thread.

      1. Create a Window Application with the main form looks like:
      2. Drag and Drop component UltimateEmailValidator from the Toolbox Window to your newly created form.

        Now you can see your object in Component Design Panel
      3. Right click on the UltimateEmailValidator component you have just created, you will see its property like that:
      4. You can change UltimateEmailValidator settings in the property window to accommodate to your needs.
        By default, UltimateEmailValidator will automatically detect DnsServers so that you don't need to specify DNS Server if the detected DnsServers support Smtp mail service.
      5. Example code below shows you how to handle log messages generated by threads:
        using System;
using System.ComponentModel;
using System.Windows.Forms;
using ComponentPro.Net;
using ComponentPro;

namespace MultipleThreads
{
    public partial class MTForm : Form
    {
        private readonly bool _exception;
        private SettingInfo _settings;

        public MTForm()
        {
            try 
            {
                InitializeComponent();

#if !Framework4_5
                this.emailValidator.ValidateEmailsCompleted += this.sfbEmailValidator_ValidateTextFileCompleted;
#endif 
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.Message);
                _exception = true;
                return;
            }
        }

        /// <summary> 
        /// Handles the form's Load event. 
        /// </summary> 
        /// <param name="e">The event arguments.</param> 
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            if (_exception)
                this.Close();

            _settings = SettingInfo.LoadConfig();

            emailValidator.ProxyHttpConnectAuthMethodMethod = _settings.ProxyMethod;
            emailValidator.ProxyHost = _settings.ProxyServer;
            emailValidator.ProxyPassword = _settings.ProxyPassword;
            emailValidator.ProxyPort = _settings.ProxyPort;
            emailValidator.ProxyType = _settings.ProxyType;
            emailValidator.ProxyUserName = _settings.ProxyUser;
            emailValidator.ProxyDomain = _settings.ProxyDomain;

            #region Settings

            // Initialize the text box. 
            txtEmailListThread.Text = _settings.EmailListFile;

            #endregion 
        }

        /// <summary> 
        /// Handles the form's Closing event. 
        /// </summary> 
        /// <param name="e">The event arguments.</param> 
        protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
        {
            _settings.EmailListFile = txtEmailListThread.Text;
            _settings.SaveConfig();

            base.OnClosing(e);
        }

        /// <summary> 
        /// Handles the Browse file button's Click event. 
        /// </summary> 
        /// <param name="sender">The button object.</param> 
        /// <param name="e">The event arguments.</param> 
        private void btnBrowseFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();
            try 
            {
                dlg.FileName = txtEmailListThread.Text;
                dlg.Filter = "List File (*.txt)|*.txt|All files (*.*)|*.*";
                dlg.FilterIndex = 1;
                dlg.Title = "Select Email List File";
                // Show Open file dialog. 
                if (dlg.ShowDialog() != DialogResult.OK)
                    return;

                txtEmailListThread.Text = dlg.FileName;
            }
            catch 
            {
                MessageBox.Show(dlg.FileName + " is not a valid address list", "Error");
            }
        }

        void EnableDialog(bool enable)
        {
            txtEmailListThread.Enabled = enable;
            btnBrowseFile.Enabled = enable;
            btnProxy.Enabled = enable;

            btnSingleThread.Enabled = enable;
            btnTwoThreads.Enabled = enable;
            btnAbort.Enabled = !enable;

            Util.EnableCloseButton(this, enable);
        }

        /// <summary> 
        /// Handles the TwoThreads button's Click. 
        /// </summary> 
        /// <param name="sender">The button object.</param> 
        /// <param name="e">The event arguments.</param> 
        private void btnTwoThreads_Click(object sender, EventArgs e)
        {
            // Clear logs. 
            lst1AdvancedLog.Items.Clear();
            lst2AdvancedLog.Items.Clear();
            lst1Log.Items.Clear();
            lst2Log.Items.Clear();

            try 
            {
                // Disable controls. 
                EnableDialog(false);
                // Start validating emails in the specified file with multi-threads (2). 
                emailValidator.MultiThreadsValidateTextFile(txtEmailListThread.Text, 2, true);
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                EnableDialog(true);
            }
        }

        private void sfbEmailValidator_MessageLogging(object sender, ComponentPro.Net.EmailValidatorLogEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatorLogEventArgs>(MessageLogging), sender, e);
        }

        /// <summary> 
        /// Handles the emailvalidator's MessageLogging event. 
        /// </summary> 
        /// <param name="sender">The email validator object.</param> 
        /// <param name="e">The event arguments.</param> 
        void MessageLogging(object sender, ComponentPro.Net.EmailValidatorLogEventArgs e)
        {
            AdvancedLog(e.SmtpTranscript, e.ThreadId);
        }

        /// <summary> 
        /// Logs message. 
        /// </summary> 
        /// <param name="message">The message to log.</param> 
        /// <param name="threadId">The Thread Id.</param> 
        void AdvancedLog(string message, int threadId)
        {
            message = message.Replace("\r\n", string.Empty);

            // Validate Email Addresses loaded from a file with two threads                     
            ListBox lb = threadId == 0 ? lst1AdvancedLog : lst2AdvancedLog;
            lb.Items.Add(message);
        }

        /// <summary> 
        /// Logs message. 
        /// </summary> 
        /// <param name="message">The message to log.</param> 
        /// <param name="threadId">The Thread Id.</param> 
        void Log(string message, int threadId)
        {
            // Validate Email Addresses loaded from a file with two threads 
            ListBox lb = threadId == 0 ? lst1Log : lst2Log;
            lb.Items.Add(message);
        }

        /// <summary> 
        /// Handles the Single Thread button's Click event. 
        /// </summary> 
        /// <param name="sender">The button object.</param> 
        /// <param name="e">The event arguments.</param> 
        private void btnAbort_Click(object sender, EventArgs e)
        {
            // Abort the operation. 
            btnAbort.Enabled = false;
            emailValidator.Cancel();
        }

        /// <summary> 
        /// Handles the Single Thread button's Click event. 
        /// </summary> 
        /// <param name="sender">The button object.</param> 
        /// <param name="e">The event arguments.</param> 
#if Framework4_5
        async 
#endif 
            void btnSingleThread_Click(object sender, EventArgs e)
        {
            // Make sure the email list file textbox is not empty. 
            if (txtEmailListThread.Text.Length == 0)
            {
                MessageBox.Show("Please enter file name.");
                return;
            }

            // Disable controls. 
            EnableDialog(false);

            // Clear logs. 
            lst1AdvancedLog.Items.Clear();
            lst2AdvancedLog.Items.Clear();
            lst1Log.Items.Clear();
            lst2Log.Items.Clear();

            // Reset counters. 
            _processed = 0;
            _passed = 0;

#if Framework4_5 || SYNC
            try 
            {
#if SYNC
                emailValidator.ValidateTextFile(txtEmailListThread.Text);
#else 
                // Asynchronously Validate a Text File. 
                await emailValidator.ValidateTextFileAsync(txtEmailListThread.Text);
#endif 
                MessageBox.Show(string.Format("Single thread validation completed. {0} email(s) processed, {1} passed", _processed, _passed));
            }
            catch (Exception ex)
            {
                Util.ShowError(exc);
            }

            // Enable controls. 
            EnableDialog(true);
            }
#else 
            // Asynchronously Validate a Text File. 
            emailValidator.ValidateTextFileAsync(txtEmailListThread.Text);
#endif 
        }

        private void sfbEmailValidator_ThreadsCompleted(object sender, EmailValidatorThreadsCompletedEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatorThreadsCompletedEventArgs>(ThreadsCompleted), sender, e);
        }

        /// <summary> 
        /// Handles the emailvalidator's ThreadsCompleted event. 
        /// </summary> 
        /// <param name="sender">The emailverifer object.</param> 
        /// <param name="e">The event arguments.</param> 
        void ThreadsCompleted(object sender, EmailValidatorThreadsCompletedEventArgs e)
        {
            MessageBox.Show(string.Format("Multi-threads validation completed. {0} email(s) processed, {1} passed", e.EmailsProcessed, e.EmailsPassed));
            EnableDialog(true);
        }

        private void sfbEmailValidator_ThreadCompleted(object sender, EmailValidatorThreadCompletedEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatorThreadCompletedEventArgs>(ThreadCompleted), sender, e);
        }

        /// <summary> 
        /// Handles the emailvalidator's ThreadCompleted event. 
        /// </summary> 
        /// <param name="sender">The emailverifer object.</param> 
        /// <param name="e">The event arguments.</param> 
        void ThreadCompleted(object sender, EmailValidatorThreadCompletedEventArgs e)
        {
            Log(string.Format("Validation completed. {0} email(s) processed, {1} passed", e.EmailsProcessed, e.EmailsPassed), e.ThreadId);
            if (e.LastException != null)
                Log("Last error: " + e.LastException.Message, e.ThreadId);
        }

#if !Framework4_5
        /// <summary> 
        /// Handles the emailvalidator's ValidateTextFileCompleted event. 
        /// </summary> 
        /// <param name="sender">The email validator object.</param> 
        /// <param name="e">The event arguments.</param> 
        private void sfbEmailValidator_ValidateTextFileCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if (e.Error != null)
                Util.ShowError(e.Error);
            else 
                MessageBox.Show(string.Format("Single thread validation completed. {0} email(s) processed, {1} passed", _processed, _passed));

            // Enable controls. 
            EnableDialog(true);
        }
#endif 
 
        /// <summary> 
        /// Handles the proxy settings button's Click event. 
        /// </summary> 
        /// <param name="sender">The button object.</param> 
        /// <param name="e">The event arguments.</param> 
        private void btnProxy_Click(object sender, EventArgs e)
        {
            ProxySettings dlg = new ProxySettings(_settings);

            // Show the proxy settings dialog. 
            if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                // Update emailvalidator's proxy settings. 
                emailValidator.ProxyHttpConnectAuthMethodMethod = _settings.ProxyMethod;
                emailValidator.ProxyHost = _settings.ProxyServer;
                emailValidator.ProxyPassword = _settings.ProxyPassword;
                emailValidator.ProxyPort = _settings.ProxyPort;
                emailValidator.ProxyType = _settings.ProxyType;
                emailValidator.ProxyUserName = _settings.ProxyUser;
                emailValidator.ProxyDomain = _settings.ProxyDomain;
            }
        }

        private void sfbEmailValidator_EmailValidated(object sender, EmailValidatedEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatedEventArgs>(EmailValidated), sender, e);
        }

        int _passed;
        int _processed;

        private void EmailValidated(object sender, EmailValidatedEventArgs e)
        {
            if (e.Error != null)
            {
                AdvancedLog(string.Format("Email '{0}' validated at level {1} with error: {2}.", e.EmailAddress, e.ValidatedLevel, e.Error.Message), e.ThreadId);
                Log(string.Format("    Mailbox '{0}' is invalid - completed with error: {1}", e.EmailAddress, e.Error.Message), e.ThreadId);
            }
            else 
            {
                AdvancedLog(string.Format("Email '{0}' validated at level {1}.", e.EmailAddress, e.ValidatedLevel), e.ThreadId);

                if (e.ValidatedLevel == ValidationLevel.Success)
                {
                    Log(string.Format("    Completed successfully - Mailbox {0} is valid", e.EmailAddress), e.ThreadId);
                    _passed++;
                }
                else 
                {
                    Log(string.Format("    Mailbox '{0}' is invalid - completed at level: {1}", e.EmailAddress, e.ValidatedLevel), e.ThreadId);
                }
            }
            AdvancedLog("------------------------------------", e.ThreadId);
            Log("----------------", e.ThreadId);
            _processed++;

#if DEBUG
            Console.WriteLine("Evt Validated - " + DateTime.Now);
            Console.WriteLine("   Prg: " + e.ProgressPercentage);
            Console.WriteLine("   Processed: " + e.EmailsProcessed);
#endif 
        }

        private void sfbEmailValidator_Progress(object sender, EmailValidatorProgressEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatorProgressEventArgs>(Progress), sender, e);
        }

        private void Progress(object sender, EmailValidatorProgressEventArgs e)
        {
            if (e.EmailAddress != null)
                if (e.Passed)
                    Log("    Passed: " + e.Level.ToString(), e.ThreadId);
                else 
                    Log("    Failed: " + e.Level.ToString(), e.ThreadId);

            progressBar.Value = e.ProgressPercentage;
        }

        private void sfbEmailValidator_EmailValidating(object sender, EmailValidatingEventArgs e)
        {
            if (!IsDisposed)
                Invoke(new EventHandler<EmailValidatingEventArgs>(EmailValidating), sender, e);
        }

        private void EmailValidating(object sender, EmailValidatingEventArgs e)
        {
            Log(string.Format("Start validating e-mail address: '{0}'", e.EmailAddress), e.ThreadId);
#if DEBUG
            Console.WriteLine("Evt Validating - " + DateTime.Now);
            Console.WriteLine("   Prg: " + e.ProgressPercentage);
            Console.WriteLine("   Processed: " + e.EmailsProcessed);
#endif 
        }
    }
}

      See Also

      Validating a single e-mail address

      Validating a single e-mail address Synchronously