fewer new operations please

the first example has AddText routine conduct frequent new operations which is surely a code-smell
byte[] info = new UTF8Encoding(true).GetBytes(value);

IMHO guideline code should assign that to a class-wide variable ONCE and then use that prepared object thereafter
- yes even if this is demoware!

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#### Document Details

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* ID: 968f92e0-aae5-7107-de5e-cdbbfe2f5daa
* Version Independent ID: ccf9cf00-2d05-3483-9530-470e18ae8e33
* Content: [FileStream Class (System.IO)](https://docs.microsoft.com/en-us/dotnet/api/system.io.filestream?view=netframework-4.7.2)
* Content Source: [xml/System.IO/FileStream.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.IO/FileStream.xml)
* Product: **dotnet-api**
* GitHub Login: @mairaw
* Microsoft Alias: **mairaw**