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Check Internet Connectivity

How to check is your PC/ Server is connected to the internet.... there are more than one ways to do that - using wininet.dll, calling for DNS resolution, pinging a internet server, calling a web page and checking for response status and as I wanted to be sure that client is able to reach my server so put them all together.

Multithreaded Singleton in C#

Many a times you run into scenario where only one instance of a class should be created in your application. If you need to know more about Singleton pattern, this article "Singleton pattern" provides good reading. There are quite a few ways to implement this (singleton) but after doing some search on the net found this one to be best for my case.