This book covers the basic programming fundamentals, professional programming logics and deep concepts of programming in .NET such as the flow control statements in C# and Visual Basic, the basic programming techniques, procedures and procedural programming concepts, arrays, structures, delegates, Lambda Expression, Errors and Exceptions handling in .NET, Windows applications development, Console applications development, Object Oriented programming, the study of different Namespaces, Files and Streams handling in C# and Visual Basic programming languages, Introduction to Database and Database Management System, Database Programming, LINQ in .NET, Collections in .NET, Web Technologies in .NET, ASP.NET, the basic requirements of ASP.NET, Websites and Web applications development, MVC Web application development, Web Services, Web APIs. This book covered the above-mentioned topics in details in a very simple way. It also contains various advanced logical programs. Each topic in this book is explained with suitable programming examples. The programs in this book are error free and fully tested and executed using Microsoft Visual Studio.NET 2015 Enterprise Edition. This book provides deep programming techniques and knowledge from beginning level to the higher level and it is efficient for all those students, teachers, and researchers who want to get professional programming logics and become professional programmers.