This course has very recently been updated to contain two brand new sections on HashSet and SortedSet with a total of five additional lectures introducing the section topics and offering extensive practical code base coverage over these sections. This course covers the Non-Generic, Generic, Concurrent and Specialized Collection classes in C#. The course includes important concept building topics in Reflection, Multi-threaded applications (with thread safety), Asynchronous Programming and Object-Oriented concepts of Interfaces and Abstract Class that the students need to grasp in order to get the full benefits from the course. Several coding exercises, an assignment, and a mini-project are aimed to keep the students engaged with the contents. These exercises are also means of self-assessing the progress with the course. A number of bonus articles and lectures have been added to enhance the learning process in related technologies.