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Difference Between ref and out Keywords

=> ref causes an argument to be passed by reference not by value.  It provides a reference to the source value and changes made in the method will be made to the source object
=> Arguments passed as ref must be initialized before they are passed.
=> out also causes an argument to be passed by reference.  Changes made to the parameter are also changed in the source.
=> Arguments passed using out do not have to be initialized first.
=> The called method must assign a value prior to the method return statement
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