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Extract block of text from text file c#

I need to open a text file, extract a block of text from it (from [TEST] to [TESTEND] and write that block to another file.
I'm pretty new to c# but I understand I need to read it with stream reader, then do some kind of split before using streamwriter to publish it, but I don't know how to split that out.

The file I will be opening will look something like this... (Obviously the words will be different)

NOCOPY
NOCOPY
NOCOPY
NOCOPY
NOCOPY
[TEST]
COPY1
COPY2
COPY3
COPY4
COPY5
[TESTEND]
NOCOPY
NOCOPY
NOCOPY
NOCOPY
NOCOPY

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ASKER

PS. I know it looks rough, but I'm only working on the idea right now. I will clean it up later.

ASKER

Nevermind I figured it out by adding

int i2 = fileread.IndexOf("[TESTEND]");
int i3 = i2 - i;

Thanks for the the help SriVaddadi.