Internet Synchronized Clock using C#. Part 2

In previous part we got some methods just to get time from internet. But this may be not enough for the real clock. Let’s tell us current UTC time and will synchronize with internet servers from time to time to ensure accuracy.
First of all, lets put all methods from previous part inside some class, let it be called InternetTimeGetter.
We want to have clock which is synchronized with internet. Since synchronization may take some time or even fail we don’t want our application to freeze while performing synchronization. This means that we need background thread for this. We may use Task class for this. Also we will need some variables to keep current time value and last synchronization time. Let’s start

Internet Synchronized clock using C#. Part 1

Task – show clock that is synchronized with some internet time server.

In this part I’ll just try to get UTC time from the server and in Part 2 I’ll use this code to create simple clock.
Some search pointed me to the http://tf.nist.gov/tf-cgi/servers.cgi page. It contains list of servers placed in US which provide UTC time on demand. Another page from that site (http://www.nist.gov/pml/div688/grp40/its.cfm) gives information about supported protocols. One of the is Network Time Protocol (RFC-1305) and another one is Daytime Protocol (RFC-867). Network Time Protocol (NTP) is a little bit more complicated and it provides more features. Daytime Protocol is simpler, but it should be just enough for this task.