Constructors in C#

http://www.dotnet-tricks.com/Tutorial/csharp/MSN0140812-Constructor-in-C-Sharp.html

http://msdn.microsoft.com/en-us/library/ace5hbzh.aspx
http://www.c-sharpcorner.com/Forums/Thread/176868/advantage-of-private-constructor-in-C-Sharp.aspx