How to Configure SSL in VB.NET

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How to Configure SSL
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Another important security-related property is SmtpClient.EnableSsl. When you set this value to true, the runtime encrypts the SMTP communications using SSL. Not all SMTP servers support SSL, but you should always enable this property if support is available.
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How to Send a Message Asynchronously
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Sending an e-mail message often takes less than a second. Other times, however, the SMTP server might be slow or completely unresponsive, causing your application to wait for the value specified by SmtpClient.Timeout. While your application waits for the SMTP server (up to 100 seconds by default), your application is unresponsive and the cursor changes to an hourglass. Users don t have much patience for unresponsive applications, and there is a good chance they will terminate your application if you make them wait too long. Fortunately, you can send e-mails asynchronously to enable your application to respond to the user while you wait for the message to be sent. You can even give the user the
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Lesson 2: Sending E-mail
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opportunity to cancel the e-mail transmission. To send a message asynchronously, perform these tasks: 1. Create a method to respond to the SmtpClient.SendCompleted event. This method needs to determine whether the transmission was successful, unsuccessful, or cancelled. 2. Add your event handler to SmtpClient.SendCompleted. 3. Call SmtpClient.SendAsync. 4. If you wish, provide the user the opportunity to cancel the e-mail by calling the SmtpClient.SendAsyncCancel method. For example, the following method responds to an SmtpClient.SendCompleted event (it requires the System.ComponentModel namespace):
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' VB Sub sc_SendCompleted(ByVal sender As Object, _ ByVal e As AsyncCompletedEventArgs) If e.Cancelled Then Console.WriteLine("Message cancelled") Else If Not (e.Error Is Nothing) Then Console.WriteLine("Error: " + e.Error.ToString) Else Console.WriteLine("Message sent") End If End If End Sub // C# static void sc_SendCompleted(object sender, AsyncCompletedEventArgs e) { if (e.Cancelled) Console.WriteLine("Message cancelled"); else if (e.Error != null) Console.WriteLine("Error: " + e.Error.ToString()); else Console.WriteLine("Message sent"); }
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The following code creates the SmtpClient object, adds the event handler, calls the asynchronous send, and then immediately cancels the send. Naturally, in real code, you would wait for the user to initiate a cancellation. This code assumes a MailMessage object named mm already exists:
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' VB Dim sc As SmtpClient = new SmtpClient("server_name") ' Add the event handler AddHandler sc.SendCompleted, AddressOf sc_SendCompleted
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15
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Mail
' Send the message asynchronously sc.SendAsync(mm, Nothing) ' Cancel the send sc.SendAsyncCancel() // C# SmtpClient sc = new SmtpClient("server_name"); // Add the event handler sc.SendCompleted += new SendCompletedEventHandler(sc_SendCompleted); // Send the message asynchronously sc.SendAsync(mm, null); // Cancel the send sc.SendAsyncCancel();
SmtpClient.SendAsync accepts two parameters: the MailMessage object to be sent and a generic Object. You can specify null or any other object for the second parameter; it is strictly for your own use. The .NET Framework simply passes it to the event handler. If you were sending multiple messages asynchronously, you could use the second parameter to keep track of which message generated the event.
Lab: Send an E-mail Message
In this lab, you will complete the application you created in Lesson 1 by sending the e-mail message. If you encounter a problem completing an exercise, the completed projects are available along with the sample files.
Exercise 1: Create an SmtpClient Object to Send a MailMessage Object
In this exercise, you will extend an existing application to create an SmtpClient object and send an e-mail message. 1. Navigate to the \<InstallHome>\15\Lesson2\Exercise1\Partial folder and open either the C# version or the Visual Basic .NET version of the solution file. Alternatively, you can continue working with the application you created in Lesson 1, Exercise 1, adding new code right after the mail message definitions. 2. Add the System.Net namespace to your code for Form1. (You will need the System .Net.NetworkCredential class.) 3. Write code within the try/catch block to create an instance of SmtpClient, enable SSL if required, and configure credentials if required. The following code demonstrates this:
' VB ' Configure the mail server Dim sc As SmtpClient = New SmtpClient(serverTextBox.Text)
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