Answer Posted / stanly jose

String and StringBuilder class stores strings. But you
cannot change a String object after creating one.
eg: String name = "Stanly";
you wan to change the same string name to
eg: name = "Stanly Jose";
then a new String object is creating in memory and assign
the new value as "Stanly Jose".
(A new name object is creating in memory and the
value "Stanly Jose" is assinging to the newly created
space.)

But StringBuilder class occupies the same space even if you
change the value.

If you are doing string concatenation StringBuilder class
is far better in performance than String class.

You can use StringBuilder's Append() method to use
concatenation.

note:
system.string is immutable,system.stringbuilder was
designed with the purpose of having a mutable string where
a variety of operations can be performed.

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