(Some basic introductions to C#, including: 1. What is C#? 2. Java and C# 3. Main features of C# 4. Installation and running environment 5. C# editor 6. Program structure of C# 7. C# and title space 8. Writing and compiling of a classic routine in C# 9. C# programming practice Exercise ABC1, use VisualStudio.NET to write C# program 2, use VisualC# to create Windows application program 3, create C# class library (Dll))