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From which of these classes, the character based output stream class Stream Writer is derived?

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From which of these classes, the character based output stream class Stream Writer is derived?

(a) TextWriter

(b) TextReader

(c) Character Stream

(d) All of the mentioned

The question was asked in exam.

This key question is from Character Stream in division Console I/O Operations and Stream Classes of C#

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Best answer
The correct choice is (a) TextWriter

Easiest explanation - StreamWriter is derived from TextWriter. To create a character-based output stream, wrap a Stream object (such as a FileStream) inside a StreamWriter.

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