The article's main focus is , to create the application using Google's GeoCoding/Reverse Geocoding.
This article will teach you what GeoCoding and Reverse Geocoding is and how to write a simple C# console application.
I also added some links, for more detailed information for this topic.
The Global Positioning System (GPS) is a space-based global navigation satellite system (GNSS) that provides reliable location and time information in all weather and at all times and anywhere on or near the Earth when and where there is an unobstructed line of sight to four or more GPS satellites. A geographic information system (GIS) or geospatial information system is any system that captures, stores, analyzes, manages, and presents data that are linked to location(s). In the simplest terms, GIS is the merging of cartography, statistical analysis, and database technology.