Archive July 2019

Multiple email validations in multiple text boxes with comma separate email ids in Javascript

Before Form submit, if you have multiple text boxes for emails like To Email and Cc Email, and both text boxes having multiple email ids with comma separate, then before form submit you can add validation through JQuery or java script.


<!DOCTYPE html>

To Email: <textarea name=”ToEmail” id=”ToEmail”></textarea><br>
CC Email: <textarea name=”CCEmail” id=”CCEmail”></textarea><br>
<input type=”submit” value=”Submit”>


$('form').submit(function () {
        var ToEmail = $('#ToEmail').val();
        var CCEmail = $('#CCEmail').val();
        var validArray = [];
        var emails = ToEmail.replace(/\s/g, '').split(",");
        Array.prototype.push.apply(emails, CCEmail.replace(/\s/g, '').split(","));
        var valid = true;
        var regex = /^(([^&amp;amp;lt;&amp;amp;gt;()[\]\\.,;:\s@\"]+(\.[^&amp;amp;lt;&amp;amp;gt;()[\]\\.,;:\s@\"]+)*)|(\".+\"))@@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;

        for (var i = 0; i &amp;amp;lt; emails.length; i++) {
            if (emails[i] == "" || !regex.test(emails[i])) {
                valid = false;
        var isFalse = validArray.includes(false);
        if (isFalse == true) {
alert("Please enter emails in proper format !");
            return false;
        else {
            return true;

Now Here an array will store comma separate email ids of first text box and then same array will append the more email ids from another text box, for this we have used :

Array.prototype.push.apply(emails, CCEmail.replace(/\s/g, '').split(","));

Above line of code will append second text box email ids into array, that already having values of first textbox.(email)

Note:- If you are working on ASP.NET MVC Razor then in Regex Expression you have to replace @ to @@, because @ will determine as razor syntex.

Sending Mail To Admin On USB Insertion or Removal In C#

Here is the c# console code to create a event watcher to monitor, if any usb attached or detached from PC.

Simple just create a console application in visual studio and install a package from nuget to import namespace System.Management.

Install-Package System.Management -Version 4.5.0

And Code is Bellow :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Management;

namespace USB
    class Program
        public enum EventType
            Inserted = 2,
            Removed = 3

        static void Main(string[] args)
            ManagementEventWatcher watcher = new ManagementEventWatcher();
            WqlEventQuery query = new WqlEventQuery("SELECT * FROM Win32_VolumeChangeEvent WHERE EventType = 2 or EventType = 3");

            watcher.EventArrived += (s, e) =>
                string driveName = e.NewEvent.Properties["DriveName"].Value.ToString();
                EventType eventType = (EventType)(Convert.ToInt16(e.NewEvent.Properties["EventType"].Value));

                string eventName = Enum.GetName(typeof(EventType), eventType);

                Console.WriteLine("{0}: {1} {2}", DateTime.Now, driveName, eventName);
                Console.WriteLine("Mail admin"); //You can write your email code here

            watcher.Query = query;


you can write your email sending code after Console.WriteLine(“{0}: {1} {2}”, DateTime.Now, driveName, eventName);