The functions of the two colons (:) in C # Colon: C #

Global: system. Console. writeline (number); where is the colon used? point is the space class, which indicates the meaning of the next layer? Here: The GAC identifier "Global" is used in a special way, and "." is not a type. Global is a new keyword in C #2.0. Theoretically, if CodeIf you write well, you do not need to use it. Suppose you have written a class named system. Then when you write System in the Code, the compiler does not know whether you want to refer to the system class or the system namespace, the system namespace is already the root namespace and cannot be specified by a full name restriction. In the previous C # version, this is an unsolved problem. Now, you can use global: System to represent the system root namespace, and use your own mynamespace. System to represent your class.