What is preprocessor directivees and its use?


C# preprocessor is fundamentally similar to C++ preprocessor.
The whole concept in C# has been taken from C++ language.
The main use of preprocessor directives are as follows:
1. Conditional compilation
2. Line control
3. Error and warning reporting

There are two methods to define directive as follows:
a. Define in our C# program
b. Define them at command line at compiling time

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