Answer Posted / lakshmi

When we pass a parameter as ref to a method, the method
refers to the same variable and changes made will affect
the actual variable. even the variable passed as out
parameter is same as ref parameter, but implementation in
c# is different,
Arguement passed as ref parameter must be initialized
before it is passed to the method. But in case of out
parameter it is not necessary. But after a call to a method
as out parameter it is necessary to initialize.
When to use out and ref parameter, out parameter is used
when we want to return more than one value from a method.

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