Writing to txt file with StreamWriter and FileStream

Question

I ran into something interesting when using a StreamWriter with a FileStream to append text to an existing file in .NET 4.5 (haven\'t tried any older f

Answer 1

The difference between the two code snippets is the use of using. The using statement disposes the object at the end of the block.

A StreamWriter buffers data before writing it to the underlying stream. Disposing the StreamWriter flushes the buffer. If you don't flush the buffer, nothing gets written.

From MSDN:

You must call Close to ensure that all data is correctly written out to the underlying stream.

See also: When should I use “using” blocks in C#?