C# Constants

• Constants are immutable values which are known at the compile time.
• They do not change for the life of the program
• C# built in types may be declared as constants
• User-defined types including Classes, structs , arrays cannot be 'const'
• C # does not support const methods,properties or events
• When a complier encounters a const identifier in c# source code, it substitutes the literal value into the intermediate language(IL) code the produces 
• Because there is no variable address associated with a constant at run time.
• Constant fields cannot be passed by reference 
• Constants are marked by public,private,protected,internal.                                                                      

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