C # Use Annotations to cancel execution of program statements

You can use annotations (#if, #elif, #else, #endif, #define) to control the execution of statements with the following code:

public string info ()
        {
            String strionf;
            #if (Hywork==false)
                strionf = "Can not if";
                return strionf;
            #elif (Hywork==true)
                strionf = "do if";
                return strionf;
            #endif
        }

In the above code, you can control the execution of the statement by using the value of the name symbol (hywork). Where the value of the hywork can be defined using #define. If you use the #define definition, the Hywork value is true, or false.

Note: You must use the #define name symbol at the beginning of the program, and before any other keywords, that is to say, precede the namespace. The code that uses the #define name symbol is as follows:

#define Hywork