Answer / sreekanth m

Two keywords are "ref" and "out".

the difference between them are: In the case of "ref", the
passed argument should be initialized first whereas
for "out", its not mandatory.

Answer / pramod singh

A variable of a reference type does not contain its data
directly; it contains a reference to its data. When you pass
a reference-type parameter by value, it is possible to
change the data pointed to by the reference, such as the
value of a class member. You cannot change the value of the
reference itself; that is, you cannot use the same reference
to allocate memory for a new class and have it persist
outside the block. To do that, pass the parameter using the
ref (or out) keyword. For simplicity, the following examples
use ref.

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