Please use Delegate and use Window Form

Please make sure:

No duplication subscription is allowed; in other words, if I try to subscribe using my email multiple times, you app should not allowed it.

Your app should be able to deal with multiple subscribers. [hint: use collections to hold the subscribers information]

In the real world, the notification management system consists of two parts, one is to allow clients to subscribe/unsubscribe the notification, and another part is to facilitate administrator(s) to publish the notification. This assignment simplifies the problem, and merges two parts as one. In this assignment, you are asked to implement a C# application to mimic notification management system. You are required to use delegate.

Your app facilitates clients to subscribe/unsubscribe notification as well as send notification to all subscribers. Your App needs to make sure that the provided email address is valid and provided cell phone number is followed the specified format.

After the app has been launched, following GUI (or similar one) should be presented. As there is no subscriber when the app just launches, Publish Notification button is disabled.

After Manage Subscription button clicked, following GUI (or similar one) should be popped up to allow clients to subscribe or unsubscribe notification. If an invalid email address has been provided, error message should be provided.

After Publish Notification button clicked, following GUI is presented to facilitate notification publish.

Please make sure:

No duplication subscription is allowed; in other words, if I try to subscribe using my email multiple times, you app should not allowed it.

Your app should be able to deal with multiple subscribers. [hint: use collections to hold the subscribers information]

SAMPLE Code

Driver class

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

namespace MulticastDelegate { class Driver { public static void Main(string[] args) { Publisher publisher = new Publisher(); SendViaMobile sendMobile1 = new SendViaMobile("416 1234567");

SendViaMobile sendMobile2 = new SendViaMobile("416 1239999"); SendViaEmail sendEmail1 = new SendViaEmail("yli@my.centennialcollege.ca");

SendViaEmail sendEmail2 = new SendViaEmail("yli202@my.centennialcollege.ca");

//Subscribing for Mobile notifications sendMobile1.Subscribe(publisher); sendMobile2.Subscribe(publisher);

sendEmail1.Subscribe(publisher); sendEmail2.Subscribe(publisher); //sub2.UnSubscribe(publisher); //Invoking the delegate Only Mobile will receive notifications. publisher.PublishMessage("Hello You Have New Notifications for COMP212"); sendEmail2.UnSubscribe(publisher); publisher.PublishMessage("Hello You Have New Notifications for COMP000"); //sendEmail1.UnSubscribe(publisher);

Console.ReadKey();

} } }

Publisher class

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

namespace MulticastDelegate { //publisher will notify the message to the subscriber public class Publisher { //Declare Delegate public delegate void PublishMessageDel(string msg);

//Declare an instance variable which is a Delegate object public PublishMessageDel publishmsg = null;

//Method used to Invoke Delegate public void PublishMessage(string message) { //Invoke Delegate publishmsg.Invoke(message); } } }

SendViaEmail class

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

namespace MulticastDelegate { public class SendViaEmail { public String EmailAddr { get; set; }

public SendViaEmail() { }

public SendViaEmail(String emailAddr) { EmailAddr = emailAddr; }

public void sendEmail(string msg) { Console.WriteLine("The message" + "\""+ msg+ "\" has already sent to "+ EmailAddr); }

public void Subscribe(Publisher pub) { pub.publishmsg += sendEmail; }

public void UnSubscribe(Publisher pub) { pub.publishmsg -= sendEmail; } } }

SendViaMobile class

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

namespace MulticastDelegate { public class SendViaMobile { public String CellPhone { get; set; }

public SendViaMobile() { }

public SendViaMobile(String phone) { CellPhone = phone; }

private void sendMessage(string msg) { Console.WriteLine("The message "+ "\"" + msg+ "\" has already texted to " + CellPhone ); }

public void Subscribe(Publisher pub) { pub.publishmsg += sendMessage; }

public void UnSubscribe(Publisher pub) { pub.publishmsg -= sendMessage; } } }

Notification Manager Manage Subscription Publish Notification Exit Notification Sent by Email Invalide email address Notification Sent By SMS Nitification Content