Interviews in C#

Creator QR in C# Interviews

Following is a list of company personnel interviewed and their statements:

It s critical to customer satisfaction that our client database is accurate. We ve had several situations where someone mistyped an address or a phone number, and this resulted in missed deliveries, unsatisfied customers, and lost sales. What we d like is to automatically send a confirmation e-mail to customers when we make a change to their contact information. If the change is incorrect, the customer should be able to reject the change. I suppose they could either reply to the e-mail, click a link, or call us, based on how hard it is for you to develop the solution. The rejections shouldn t be that common.

Sales Manager Chief Security Officer I understand the desire to confirm changes to contact infor-

mation; however, we need to manage our risk. Sending confidential information through e-mail is never good. You can, and should, encrypt the connection to the SMTP server, but you lose any control over the security of the data after you hand it off. Messages often bounce through several different servers, and most connections are not encrypted. Being that this is just contact information, I m okay with sending the messages, but please do use security when possible.

Answer the following questions for your manager. 1. What .NET Framework classes will you use to send the e-mails 2. How could you process e-mail responses from customers 3. How can you protect the data in the e-mail messages

To help you successfully master the Implementing interoperability, reflection, and mailing functionality in a .NET Framework application exam objective, complete the following tasks.

Send Electronic Mail to a Simple Mail Transfer Protocol (SMTP) Server for Delivery from a .NET Framework Application

For this task, you should complete at least Practices 1 and 2. If you want a better understanding of how to work with file attachments, complete Practices 3 through 5. For a detailed understanding of the importance of using SSL, complete Practice 6 as well.

attempt to send messages through different SMTP servers. Note how different servers respond. To look up the SMTP server for any domain, open a command prompt and run the command nslookup -type=mx domain (for example, nslookup type=mx contoso.com).

Practice 3 Attempt to send increasingly larger file attachments until the SMTP server rejects your message. Test several different SMTP servers. Note the maximum file size. Practice 4 Using a text file as an attachment, change the file extension to .txt,

.jpg, .bat, .cmd, .dll, and .exe. Note which file extensions different mail servers allow, and which of the attachments can be viewed using e-mail clients such as Microsoft Outlook.

Practice 5 In 6, Graphics, you created an application that generates a chart. Add a button to the application that sends the chart as an e-mail attachment. Practice 6 Using a protocol analyzer (also known as a sniffer) such as Microsoft

Network Monitor, capture the network communications created when sending a message using standard SMTP, standard SMTP with user credentials, and SMTP protected by SSL. Use the protocol analyzer to view the raw packets and determine whether an attacker with access to the network could view your message and user credentials.

The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-536 certification exam content. You can set up the test so that it closely

simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.