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  • Difference between Readonly and const keyword in C#.

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    Const keyword

    • Const variable in C# are compile time variable i.e value is known at compile time.
    • The assignment to const variable is only done at the time of declaration and this value of variable remain constant throughout lifetime of the program.
    • These variable are accessed via "Classname.Variablename".
    • Such variable can be declared and intialized in any method of class.

    Readonly keyword

    • Readonly is a keyword which when used with a variable then the value of that variable can only be changed either at runtime or at the time of the instance initialization.
    • The assignment to readonly variable is only done at the time of declaration or through constructor of the class.
    • These variable are accessed via "Instancename.Variablename".
    • Readonly keyword cannot be used with variables in the methods even the value of readonly variable cannot be changed in any method of the class.

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