Question

Which of these classes is used to create an object whose character sequence is mutable?

(a) String()

(b) StringBuilder()

(c) String() & StringBuilder()

(d) None of the mentioned

The question was posed to me during an interview.

My question is from Writing Console Output Operations in section Console I/O Operations and Stream Classes of C#

Answer 1

Right answer is (b) StringBuilder()

Easiest explanation - Mutable strings are dynamic strings. They can grow dynamically as characters are added to them. stringbuilder class supports those methods that are useful for manipulating dynamic strings.