Answer / suhasini suresh

Reference types are stored on the run-time heap; they may
only be accessed through a reference to that storage. This
allows the garbage collector to track outstanding
references to a particular instance and free the instance
when no references remain. A variable of reference type
always contains a reference to a value of that type or a
null reference. A null reference refers to nothing; it is
invalid to do anything with a null reference except assign
it. Assignment to a variable of a reference type creates a
copy of the reference, not a copy of the value being
referenced.

Value types are stored directly on the stack, either within
an array or within another type. When the location
containing a value type instance is destroyed, the value
type instance is also destroyed. Value types are always
accessed directly; it is not possible to create a reference
to a value type. Prohibiting such a reference makes it
impossible to refer to a value class instance that has been
destroyed. A variable of a value type always contains a
value of that type. Unlike reference types, the value of a
value type cannot be a null reference, nor can it reference
an object of a more derived type. Assignment to a variable
of a value type creates a copy of the value being assigned.

Answer / kinjal

c# provides a set of datatypes. datatypes of c# contain two categories one is value type and another is reference type.

value type is a variable. datatype value store in variables while a variable of a reference type stores a reference to the data.

both value type and reference type have one common thing - both derived from system.object.

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