This book comprehensively introduces Visual Basic.NET programming through cases. The book is divided into 3 parts and 8 chapters to explain VIsud Basic in a clear and easy-to-understand manner. NET programming knowledge points. The first part is a brief introduction. Various advantages of NTT operating environment and choosing Visual Basic. NET; the second part uses "console application" to gradually deepen Visual Basic. NET program writing, focusing on basic syntax, object-oriented, delegation and event processing, network programs, multi-threading, etc.; the third part uses "Windows applications" to draw GDI+ graphics and develop utility programs to understand Windows Form's various properties, event settings and the use of various controls. This book is a Visual Basic that is easy for junior and intermediate learners to accept. NET programming textbook, it is also suitable for readers who have some knowledge of Visual Basic. NET programming technology reference material.