About the Tutorial

and
Non-Overloadable
Operators.................................................................................... 173 
23. 
INTERFACES....................................................................................................................... 181 
Declaring
Interfaces ............................................................................................................................... 181 
24. 
NAMESPACES .................................................................................................................... 184 
Defining
a
Namespace
........................................................................................................................... 184 
The
using
Keyword................................................................................................................................. 185 
Nested
Namespaces............................................................................................................................... 187 
vi 

---

C# 
25. 
PREPROCESSOR DIRECTIVES .............................................................................................. 190 
Preprocessor
Directives
in
C#................................................................................................................. 190 
The
#define
Preprocessor
...................................................................................................................... 191 
Conditional
Directives............................................................................................................................ 192 
26. 
REGULAR EXPRESSIONS ..................................................................................................... 194